One Adapter to Rule Them All
If you’ve spent any time looking into “Super Single” conversions for your Sprinter 3500, you're probably well aware of the frustration and trade-offs that come with the "upgrade". Most kits on the market feel like a compromise: oddball offsets, mismatched track widths, and a front-to-rear stance that looks like two different vans somehow fused together. And then there’s the spare tire. Sure, technically, you've got one, but functionally it's just decoration — hanging on the back of the van collecting rust. For a vehicle you've built to go long distances and carry serious weight, that never really made much sense to the team here at Van Compass.
The real issue isn’t just aesthetics; it’s ownership friction. Running mismatched wheel setups means tire rotations become impossible, spares aren’t truly usable, and service becomes harder the farther you get from home. For vans born to handle delivery routes, but destined for backcountry travel and heavy, long-haul builds—those compromises add up quickly. We eventually found ourselves asking a simple question: Is this really what you want on your rig?
Instead of trying to work around the problem, we went back to the source. Mercedes already solved similar engineering challenges through hub adapter systems designed to maintain proper geometry and load distribution. Taking cues from that OEM philosophy, we approached the Super Single conversion not as a wheel kit, but as a system problem. That thinking led to the development of our SUSI—the Super Single Adapter.
By converting the rear dually hubs to a standard 2500 lug pattern, our SUSI adapter allows all five wheels on the vehicle to be identical. While this transition requires an upgrade to 2500-pattern wheels—like our own 4,200 lb load-rated options or any high-capacity wheel that meets your GVW—it fundamentally changes the ownership experience. For the first time, a true five-tire rotation finally makes sense on a 3500. Tire wear stays even, replacements are easier to source, and the front and rear track widths finally align.
Of course, solving the geometry only matters if the hardware can handle the load. Not to worry, our SUSI adapter is a 26-pound beast. A forged component made from 42CrMO Chromoly steel—through-hardened, normalized, and engineered specifically for the demands of extra-heavy rigs. During development, we leaned on the Randy’s team to run extensive Finite Element Analysis (FEA) to identify and eliminate potential stress risers before production ever began. This wasn't a "one and done" test; we went through multiple rounds of analysis, specifically increasing the internal radius under the wheel flange to dramatically improve fatigue resistance and equalize stresses across the lug nut cutouts (check out the FEA White Paper here).
With matched track widths and unified geometry, the transformation is immediate. The stance looks right, but more importantly, the vehicle feels right—stable, balanced, and predictable under load. This is a Sprinter 3500 that finally works as hard, and as intelligently, as it was always meant to.
Get the Van Compass SUSI Adapter for your Sprinter 3500 here.