What Is a Class B RV? Why a Custom Camper Van Beats Factory Every Time
If you’ve been shopping for a camper van, you’ve probably run into the term “Class B RV.” Maybe you’ve compared a Winnebago Travato or an Airstream Interstate against having a van custom-built. Maybe you’re not sure which direction makes more sense.
Here’s what no one tells you clearly: the same van platforms that factory Class B manufacturers build on, the Mercedes Sprinter, Ford Transit, and Ram ProMaster, are the same platforms Sportsmobile has been converting since before most of those brands existed. The question isn’t whether to get a Class B RV. The question is whether you want a factory floor plan or one built exactly the way you want it.
What Is a Class B RV?
A Class B RV which is also called a camper van, is a motorhome built on a standard cargo van chassis. It’s the smallest category of motorized RV, ranging from about 17 to 24 feet in length. To be classified as a motorhome, a Class B must include a kitchen, a sleeping area, and a bathroom or lavatory.
Class B RVs are distinguished from other RV classes by their size and versatility. Unlike a Class A (a full-size bus-style motorhome) or a Class C (which has an extended cab-over section), a Class B drives, parks, and handles like a large van. It fits in a standard parking space, gets better fuel economy than larger rigs, and can be used as a daily driver.
Most Class B motorhomes on the market today are built on one of three chassis: the Mercedes-Benz Sprinter, the Ford Transit, Chevy Express, or the Dodge ProMaster.
Sound familiar? It should. Those are the exact platforms Sportsmobile has been building on for decades.
Class B RV vs. Custom Van Conversion: What’s the Difference?
The distinction between a “Class B RV” and a “custom van conversion” has blurred significantly in recent years. Technically, a Class B RV must include a kitchen, sleeping area, and bath to qualify as a motorhome under RVIA standards. A custom conversion may or may not include those elements; it depends entirely on what the owner wants.
In practice, the more important distinction is who built it and how:
Factory Class B (Winnebago, Airstream, Thor, etc.)
- Built on a production line in standard floor plans
- Available at RV dealerships, often in stock
- Warranty coverage through the manufacturer
- Limited customization (you pick from available options)
- Priced from $120,000 to $250,000+ for current models
Custom Van Conversion (Sportsmobile)
- Built to your exact specifications: floor plan, electrical, features, finish
- No production line constraints. Every van is different
- Direct relationship with the builder
- Full control over every component and system
- Comparable pricing for a comparable level of build quality
The custom conversion is built for you, not for a catalog.
Why Custom Beats Factory for Most Buyers
Factory Class B manufacturers have to design floor plans that appeal to the broadest possible market. They can’t build a van with a permanent desk for two dogs and a 400Ah electrical system, even if that’s exactly what you want. So they build something that most people can live with, and call it a floor plan.
Sportsmobile doesn’t work that way. We start with a conversation about how you actually use your van. Then we design a floor plan around that.
The result is a van that fits your life instead of a van you adapt your life around.
Some of what our customers prioritize that factory Class B builders don’t accommodate well:
- Dedicated workspace layouts (permanent desk, monitor mounts, cable management)
- Off-grid electrical systems sized for extended travel without shore power
- Dog-specific builds (crate bays, wash stations, durable flooring)
- 4×4 or AWD configurations for serious overland travel
- Penthouse Top pop-up roofs that add a second sleeping area
- Accessible and mobility-adapted builds (more on this below)
- Specific aesthetic preferences in materials, colors, and cabinetry finish
What Sportsmobile Offers That Factory Class B Can’t
The Penthouse Top. Sportsmobile’s signature pop-up roof has been av
ailable since the early days of the company. It adds a ventilated second sleeping area above the main living space, freeing up the entire lower floor during the day. No factory Class B manufacturer offers anything comparable. It’s one of the most requested features in Sportsmobile builds, and one of the most searched terms we rank for.
Learn About the Penthouse Top →
True customization. Not “choose from 3 upholstery colors.” We mean: design a floor plan from scratch, specify the size and brand of every major component, and approve the build before it starts.
Experience. Sportsmobile has been building conversion vans since 1961. That’s more experience than almost any motorhome manufacturer in the RV industry. We’ve built on every generation of Sprinter, Transit, and Express. We know what works and what doesn’t.
Multiple platforms. Sportsmobile builds on the Sprinter, Ford Transit, Ram ProMaster, and Chevy Express. Most factory Class B manufacturers build on one or two platforms. We can help you choose the right chassis for your use case before the build starts.
What Does a Custom Class B-Level Build Cost?
A Sportsmobile conversion built to Class B RV specifications with a kitchen, sleeping, bath, full electrical system, typically ranges from $80,000–$160,000 for the conversion work, depending on complexity. The base vehicle adds another $55,000–$70,000 for a new chassis.
That’s comparable to mid-tier factory Class B pricing, with significantly more customization and a build that matches your actual needs.
See Full Conversion Pricing → | See Pricing Examples →
Three Locations, One Standard of Quality
Sportsmobile builds at Austin TX, Huntington IN, and services at Mesa AZ. All three locations are held to the highest standards in the RV industry. If you’re local to any of our shops, we encourage you to come in and yes, bring your dog.
Contact Us → | See Vans For Sale →
Frequently Asked Questions
What is the difference between a Class B RV and a conversion van?
A Class B RV is technically a motorhome that includes a kitchen, sleeping area, and bathroom. A conversion van may include all of those features or fewer, depending on the build. In practical terms, both are built on cargo van chassis, the difference is who built it and to what spec.
Is a Sportsmobile a Class B RV?
It can be. A fully-spec’d Sportsmobile build with kitchen, bath, and sleeping area meets the definition of a Class B motorhome. Many customers choose not to register their van as an RV, which affects titling but not the features of the build.
Are custom van conversions more expensive than factory Class B RVs?
For a comparable level of build quality and features, custom and factory pricing are similar which are typically $120,000–$200,000+ total (vehicle plus conversion). The difference is that a custom build is designed for you, while a factory build is designed for mass market appeal.
How long has Sportsmobile been building camper vans?
Since 1961. Sportsmobile predates the modern van conversion industry and has built on nearly every major van platform produced in the last 65+ years.
What is a Penthouse Top?
Sportsmobile’s Penthouse Top is a motorized pop-up roof that creates a second, ventilated sleeping area above the main living space. It’s one of the most iconic and unique features available in the van conversion market, and it’s been available from Sportsmobile for decades.
