Dual rear wheels are listed as an option on the SMB 'Build Your Own' worksheets.
Mike
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Alaska to Key West, Labrador and more
Prostate cancer survivor. See Thread Prostate cancer and Sportsmobiles
2015 VW GTI 2020 Fiat 124 Spider
2012 E250 Hitop camper
Thanks for that information. Do you know if anyone has actually done it? I'd love to have the extra carrying capacity but am concerned about what cupboards i can safely place over those wheel wells.
Most mainstream RV manufacturers that make a Sprinter based RV now use the 3500 platform so that's a pretty popular chassis at this point. Make sure that you get the 3.92 (AR2) rear axle ratio and not the 4.18 (AR3) ratio that comes standard with the 3500 chassis; the higher ratio is used for towing. I highly recommend the ordering guide located here: