Adventure Wagon vs. Lost Hiway vs. Serg Supply: Which Van Interior System Is Best for Your Sprinter or Transit?

Which Van Interior System Is Best for Your Sprinter or Transit?

Whether you're planning weekend camping trips, building an off-grid adventure rig, or creating a full-time home on wheels, choosing the right interior system is one of the most important decisions you'll make during your van conversion.

The interior system serves as the foundation of your build. It includes the wall and ceiling panels, insulation, structural mounting system, electrical assemblies, wiring, lighting, trim components, and everything needed to transform an empty cargo van into a finished living space. Once that foundation is complete, you can begin adding beds, storage, kitchens, seating, electrical upgrades, and other accessories that fit your lifestyle.

Today, three companies consistently stand out when comparing modular interior systems for Mercedes-Benz Sprinter and Ford Transit vans:

• Adventure Wagon
• Lost Hiway Customs
• Serg Supply

While all three companies offer high-quality products, they approach van conversions differently. Some prioritize long-term modularity, others focus on affordability, and some emphasize delivering an all-inclusive foundation from the beginning.

In this guide, we'll compare Adventure Wagon, Lost Hiway, and Serg Supply across the factors that matter most to DIY builders and professional installers, including pricing, modularity, installation experience, fit and finish, future expandability, and overall value.

By the end, you'll have a better understanding of which interior system best fits your budget, travel style, and long-term plans.

Adventure Wagon vs. Lost Hiway vs. Serg Supply Comparison

Adventure Wagon

Starting Price: $16,000 (Sprinter 144 Interior System)

Since pioneering the modular van interior category in 2014, Adventure Wagon has become one of the most recognizable names in the camper van industry with over 3,500 interior systems on the road. Over the past decade, the company has focused almost exclusively on developing modular interior systems for Mercedes-Benz Sprinter and Ford Transit vans, resulting in thousands of completed builds across North America.

Unlike many manufacturers that divide their attention between truck campers, overland accessories, or permanent cabinetry, Adventure Wagon has continuously refined a single philosophy: build an interior that can evolve alongside the owner's adventures.

That specialization shows throughout the product line. From DIY kits and factory installations in Portland to a nationwide certified installer network and fully built RVIA-certified Recreational Utility Vehicles (RUVs), every offering is built around the same modular platform.

An Adventure Wagon Interior System Ready For Gear & Components

Complete Interior System Without the Surprise Costs

At first glance, Adventure Wagon sits in the middle of the pricing spectrum. However, comparing base prices alone doesn't tell the full story.

The complete Interior System includes many of the components that other manufacturers offer as optional upgrades or require customers to source separately. Every kit is built around Adventure Wagon's steel A-Frame structure and aircraft-grade aluminum L-Track, while also including insulation, integrated wiring harnesses, LED lighting, wall and ceiling panels, thermo-molded trim components, a Maxxair Deluxe roof fan, installation references, and all required mounting hardware.

Because these major components are already included, builders often find that the total project cost remains surprisingly competitive once comparable upgrades are added to less comprehensive systems.

Designed for DIY Builders and Future Upgrades

One of Adventure Wagon's greatest strengths is how approachable the installation process is.

The company has developed one of the largest educational libraries in the van conversion industry, complete with installation videos, detailed documentation, templates, and technical resources that guide builders through every step of the process. To top it off, their customer service team is highly rated and very knowledgable to answer any questions that arise during your installation.

Just as importantly, the interior is designed to be serviced long after the initial build is complete.

Individual wall panels can be removed without dismantling the rest of the interior, making it easy to access wiring, install new accessories, or troubleshoot electrical systems years later. Adventure Wagon also color-codes its wiring harnesses, allowing builders to quickly identify circuits instead of tracing unlabeled wires hidden behind finished walls. It's a small detail that dramatically simplifies future upgrades and maintenance.

The Most DIY-Friendly Option For Installers

The Most Adaptable Modular Platform

For many buyers, modularity is the deciding factor—and it's where Adventure Wagon continues to set the benchmark.

The system is built around a steel A-Frame paired with aircraft-grade aluminum L-Track, creating a rigid structural framework capable of securely supporting beds, cabinets, storage solutions, electrical components, and other accessories.Compared to aluminum structural systems, steel provides greater strength and rigidity for mounting heavier components while creating a more confidence-inspiring foundation for years of use on rough roads.

Rather than locking owners into one floor plan, the platform encourages continuous evolution. Beds can be repositioned, storage can be added or removed, electrical systems can expand, and accessories can be relocated as your needs change.

Whether your van serves as a family camper one month, a bike hauler the next, or a gear-hauling adventure rig for ski season, the same infrastructure adapts without requiring major reconstruction.

Adventure Wagon Let's You Modify Your Layout Quickly & Easily

Industry-Leading Fit and Finish

Where Adventure Wagon separates itself most clearly is in the overall refinement of the finished interior.

Instead of relying solely on flat wall panels, Adventure Wagon uses thermo-molded trim components to wrap windows, pillars, and other complex body contours. These molded pieces eliminate much of the exposed factory sheet metal commonly seen in many van conversions, creating an appearance that feels significantly closer to an OEM interior than a traditional cargo van conversion.

The result is cleaner panel transitions, tighter tolerances, and a more cohesive finished product that looks intentionally designed rather than assembled from individual components.

Buyers also have a wide range of finish options—including upholstered wall panels, Black HexPly, bamboo, unfinished birch, and other materials—allowing the interior to reflect different aesthetics without sacrificing functionality.

A Full Bamboo Interior System From Adventure Wagon

Built Around Quiet, Functional Storage

Adventure Wagon has also spent years refining an often-overlooked aspect of van living: storage.

Rather than relying exclusively on rigid overhead cabinetry, the company pioneered the use of modular soft storage with products like the Mule Bag system. Soft storage helps reduce rattles and weight on rough roads, keeps frequently used gear easily accessible, and allows owners to remove or reconfigure storage as their needs change.

For travelers spending long days on washboard roads or forest service trails, eliminating cabinet noise can make a noticeable difference in the overall driving experience. Combined with the modular mounting system, these soft storage solutions provide flexibility that permanent cabinetry simply can't match.

Soft Storage Means Less Rattles

Best For

Adventure Wagon is best suited for builders who view their van as a long-term investment rather than a one-time project.

Its combination of a robust steel structural system, OEM-inspired fit and finish, extensive DIY support, premium materials, modular soft storage, and unmatched expandability makes it one of the most complete interior systems available for both Sprinter and Ford Transit conversions.

For buyers who anticipate their needs changing over time—or simply want an interior that can grow with new adventures—Adventure Wagon offers one of the most future-proof foundations on the market.

Lost Hiway Customs

Starting Price: $13,318 (Sprinter 144 Pro Kit)

Lost Hiway Customs has become a well-known name among DIY van builders by offering an affordable modular interior system backed by an impressive lineup of fabricated aluminum accessories. Originally an installer of Adventure Wagon interiors, the company eventually developed a similar interior system while expanding its product catalog to include aluminum cabinets, storage solutions, and accessories for both van conversions and truck campers.

For builders looking to keep their initial investment low, Lost Hiway offers the most affordable starting price in this comparison. Its Pro Kit provides a solid foundation for a van build while leaving room for owners to customize their conversion over time.

A Budget-Friendly Entry Into Modular Van Builds

At $13,318, Lost Hiway's Pro Kit is the least expensive interior system in this comparison, making it an attractive option for DIY builders whose primary goal is minimizing upfront costs.

Rather than delivering a fully built-out interior foundation, Lost Hiway takes a more stripped-down approach. The system includes the core structural components needed to begin a conversion while allowing builders to add accessories and upgrades as their budget permits. This à la carte philosophy appeals to those who prefer spreading project costs over time rather than purchasing a more comprehensive package from the outset.

It's important to compare the total cost of ownership, however, rather than simply the advertised starting price. Features such as a roof fan, premium finishes, and other components included with competing systems may need to be purchased separately, reducing the initial price advantage as a build progresses.

Additionally, Lost Hiway currently focuses exclusively on Mercedes-Benz Sprinter vans and does not offer a complete interior system for the Ford Transit platform.

Aluminum Fabrication Is Their Strength

One area where Lost Hiway truly excels is aluminum fabrication.

The company has developed an extensive catalog of well-designed aluminum accessories, including cabinets, storage solutions, and utility products that have earned a strong reputation throughout the van community. Many of these components integrate seamlessly with both Lost Hiway's Pro Kit and Adventure Wagon's L-Track system, giving builders additional flexibility regardless of which interior platform they choose.

For owners who appreciate lightweight aluminum storage solutions and modular accessories, Lost Hiway offers one of the strongest accessory ecosystems currently available.

A Simpler Modular Platform

Like Adventure Wagon, Lost Hiway embraces a modular philosophy that allows components to be removed or added over time. Individual wall panels remain accessible, making future maintenance and upgrades easier than more permanent wood-based construction methods.

However, the Pro Kit is intentionally less comprehensive than Adventure Wagon's system.

Lost Hiway builds its platform around an aluminum structural system, which provides a lightweight mounting solution for interior components. While effective for many applications, it does not offer the same level of structural robustness as Adventure Wagon's steel A-Frame, particularly when supporting heavier accessories or creating a long-term platform designed for years of evolving use.

For builders planning extensive upgrades, heavier cabinetry, or a continually changing interior, the additional rigidity and strength of a steel mounting structure provide greater confidence over the life of the vehicle.

Functional Fit and Finish

Lost Hiway's interiors prioritize functionality over refinement.

The company primarily utilizes flat wall panels rather than thermo-molded trim pieces, leaving more of the van's factory sheet metal visible around windows, pillars, and curved body panels. Flat panels also do not take advantage of all the complexed contours within the van. While many builders appreciate the clean, industrial appearance, the finished interior retains more of the original cargo van aesthetic than systems designed with molded transition pieces. 

By comparison, Adventure Wagon's molded trim components create smoother transitions between panels and body contours, producing a noticeably more integrated, OEM-inspired appearance with more usable interior space. Builders who place a high value on craftsmanship, refined details, and premium fit and finish will likely notice the difference immediately.

That said, many DIY builders view this tradeoff as worthwhile in exchange for Lost Hiway's lower purchase price.

Best For

Lost Hiway is an excellent choice for builders looking for an affordable starting point and who are comfortable building out much of their van over time. Its strong aluminum fabrication capabilities, growing lineup of accessories, and modular design make it particularly appealing for DIY enthusiasts who prioritize value and customization.

For buyers whose primary objective is maximizing capability per dollar, Lost Hiway offers one of the strongest value propositions in the market. Those seeking a more complete, refined, and future-ready interior system may find greater long-term value in Adventure Wagon, while those simply looking for a budget-friendly modular foundation will appreciate what Lost Hiway brings to the table.

Serg Supply

Starting Price: $22,200 (Sprinter 144 Foundation Kit)

Since launching in 2019, Serg Supply has established itself as a premium option for DIY van builders looking for a comprehensive foundation to build upon. Rather than focusing primarily on modularity, the company emphasizes delivering a nearly complete interior package that minimizes the number of additional components and customizations builders need to source or complete before moving on to cabinetry, plumbing, electrical upgrades, and finishing details.

With a starting price of $22,200, the Foundation Kit is the most expensive system in this comparison. That higher price reflects the breadth of included components and the company's philosophy of providing as much of the conversion foundation as possible from the outset.

One of the Most Comprehensive Foundation Kits Available

Unlike systems that require builders to piece together multiple components over time, Serg Supply packages much of the van's structural and finishing work into a single kit. The Foundation Kit includes finished flooring, insulation, wall and ceiling panels, wiring, trim components, a Maxxair roof fan, and a shore power inlet, creating a well-rounded starting point for builders who want to check off many major installation steps at once.

Serg Supply is also the only company in this comparison to include finished flooring as part of its standard interior system. While upholstered wall finishes are available as an additional upgrade, customers can also choose from several attractive prefinished wood options, including bamboo, maple, and other premium materials that give the interior a warm, residential feel without requiring additional finishing work.

For builders who prefer purchasing a highly complete package instead of assembling individual systems over time, the Foundation Kit offers excellent value despite its higher upfront cost.

Designed for Builders with a Finished Vision

Serg Supply has continued expanding its installation documentation and educational resources, making the Foundation Kit approachable for experienced DIY builders. The system is thoughtfully engineered and designed to create a clean, finished interior while maintaining straightforward installation procedures.

Where Serg Supply differs most from Adventure Wagon and Lost Hiway is in its overall design philosophy. Rather than creating an open modular platform intended for constant evolution, the Foundation Kit is designed to become the permanent structure around which the rest of the conversion is built. Once cabinetry, electrical systems, and other interior components are installed, the build naturally becomes more fixed.

For many builders, that's exactly the goal. If you've already finalized your layout and don't anticipate making major changes in the future, this approach provides a solid, well-integrated foundation.

Less Flexible for Future Modifications

The tradeoff to Serg Supply's comprehensive approach is long-term flexibility.

Because the system relies more heavily on precision-cut wood components and a permanent construction philosophy, significant modifications later in the van's life typically require removing finished interior pieces before accessing wiring or changing the layout. Adding new systems, relocating cabinetry, or reconfiguring the interior often involves more labor than modular platforms designed specifically for future adaptability.

By comparison, both Adventure Wagon and Lost Hiway make it easier to remove individual wall panels and access the infrastructure behind them. Adventure Wagon, in particular, extends that flexibility with its steel A-Frame, integrated L-Track system, and standardized mounting architecture, making it significantly easier to add, remove, or relocate components as a van evolves over time.

For buyers who expect their van to serve different purposes throughout its life—whether that's transitioning from a weekend camper to a family adventure vehicle or adding new electrical and storage solutions years later—a more modular system may provide greater long-term value.

Warm, Residential Styling

One of Serg Supply's defining characteristics is its aesthetic.

The company's use of premium wood finishes creates an inviting interior that feels more like a custom tiny home than a converted cargo van. Builders looking for a warm, handcrafted appearance will likely appreciate the available bamboo, maple, and other wood finish options.

Like Lost Hiway, however, Serg Supply primarily relies on flat panel construction rather than thermo-molded trim components. As a result, more factory sheet metal remains visible around windows, pillars, and other curved sections of the van while limiting some usable interior space. While the overall craftsmanship is excellent, the finished appearance doesn't achieve the same OEM-inspired integration as Adventure Wagon's molded trim system, which was specifically designed to conceal exposed factory bodywork and create smoother transitions throughout the interior.

Best For

Serg Supply is an excellent choice for builders who know exactly how they want to use their van before construction begins and want to purchase one of the industry's most comprehensive foundation kits in a single package.

Its premium materials, included flooring, and thoughtfully engineered design reduce the need to source additional components and create a polished starting point for a permanent conversion. However, builders who value long-term adaptability, anticipate upgrading their van over time, or simply want the flexibility to reconfigure their layout as their adventures evolve may find greater utility in a more modular platform like Adventure Wagon.

Which Van Interior System Is Right for You?

Choosing the right van interior system ultimately comes down to how you plan to use your van—not just today, but years down the road. Every builder has different priorities, whether that's keeping costs low, creating a warm residential interior, or investing in a platform that can evolve alongside changing adventures.

Here's how these three systems compare based on the type of builder you are.

Consider More Than the Starting Price

It's easy to compare advertised prices, but the starting price rarely reflects the final cost of a completed interior.

When evaluating different systems, consider what is included in the base package and what you'll need to purchase separately. Features like roof fans, premium wall finishes, trim packages, flooring, electrical components, and installation hardware can significantly affect the total investment.

It's equally important to think about what your van might look like five years from now.

Will it always be a weekend camper? Will it eventually become a family adventure vehicle? Will you add more batteries, additional seating, upgraded storage, or a different bed configuration?

Many builders focus on getting the lowest initial price, only to discover later that modifying a permanent interior requires removing cabinetry, rebuilding finished sections, or rerouting electrical systems. A modular platform can reduce both the cost and complexity of future upgrades by making those changes part of the original design rather than an afterthought.

For many owners, the ability to adapt their van over time becomes just as valuable as the features they installed on day one.

Adventure Wagon Let's You Customize Your Layout For Your Activity

Frequently Asked Questions

What Is the Best Modular Interior System for a Sprinter Van?

The answer depends on your priorities.

If you're looking for the most adaptable platform with premium fit and finish, extensive DIY resources, and the ability to reconfigure your build over time, Adventure Wagon offers one of the most complete modular systems available.

If keeping costs as low as possible is your primary concern, Lost Hiway provides an affordable entry point with a solid lineup of aluminum accessories.

If you prefer purchasing a highly complete foundation kit and already know exactly how your van will be laid out, Serg Supply offers one of the industry's most comprehensive packages.

Is Adventure Wagon Worth the Higher Price?

Although Adventure Wagon costs more than Lost Hiway's base package, the overall value extends well beyond the advertised price.

The system includes many components that are optional upgrades elsewhere, including a Maxxair Deluxe roof fan, thermo-molded trim, integrated wiring harnesses, insulation, and a complete structural mounting system. Combined with its steel A-Frame, top-tier fit and finish, extensive educational resources and exceptional customer support, certified installer network, and long-term modularity, many builders find the overall ownership experience justifies the investment.

Can You Install an Adventure Wagon Interior Yourself?

Yes.

Adventure Wagon was designed with DIY builders in mind and offers one of the most extensive installation libraries in the industry. Detailed videos, documentation, templates, and technical support help guide builders through every step of the installation process.

For those who prefer professional installation, Adventure Wagon also offers factory installations in Portland, Oregon, along with a nationwide network of certified installers.

Which Interior System Has the Best Fit and Finish?

All three companies produce quality products, but they take different approaches to interior design.

Adventure Wagon places the greatest emphasis on creating an OEM-inspired appearance through the use of thermo-molded trim components that minimize exposed factory sheet metal and create clean transitions throughout the van.

Lost Hiway and Serg Supply primarily rely on flat panel construction, resulting in a more utilitarian appearance with more of the van's original bodywork remaining visible.

Which System Is Easiest to Upgrade Later?

Adventure Wagon offers the most flexibility for future upgrades thanks to its modular design, steel A-Frame, aircraft-grade aluminum L-Track, removable wall panels, and color-coded wiring harnesses.

Lost Hiway also supports future modifications through its modular panel system, though its simpler aluminum-framed platform offers fewer integrated features.

Serg Supply is designed as a more permanent foundation, making significant changes later in the build generally more labor-intensive.

Final Verdict

Adventure Wagon, Lost Hiway, and Serg Supply each serve different types of van builders, and none of them are inherently the "wrong" choice. The best interior system is the one that aligns with your budget, priorities, and long-term vision for your van.

Choose Lost Hiway if your primary goal is minimizing upfront cost while maintaining the flexibility of a modular interior. Its expertise in aluminum fabrication has produced an impressive ecosystem of accessories, making it an excellent option for DIY builders looking for value. For buyers focused on getting into a modular build at the lowest possible price, Lost Hiway delivers a capable foundation.

Choose Serg Supply if you already have a clear vision for your conversion and want one of the most comprehensive foundation kits available. Its included flooring, premium wood finishes, and thoughtfully engineered package make it an appealing choice for builders planning a more permanent interior from day one.

Choose Adventure Wagon if you want an interior system that's designed to evolve with your lifestyle. From its robust steel A-Frame and OEM-inspired fit and finish to its thermo-molded trim, color-coded wiring, soft storage solutions, and extensive ecosystem of compatible accessories, Adventure Wagon is engineered for builders who expect their van to adapt as their adventures change.

Whether you're hauling bikes one weekend, taking the family camping the next, or converting your van into a full-time travel rig years down the road, a modular foundation can continue to grow alongside you. That's why Adventure Wagon remains one of the most versatile and future-ready interior systems available for both Mercedes-Benz Sprinter and Ford Transit conversions.