Just how short? Sprinter chassis RVs come in one size, basically, as Daimler does not permit most builders to stretch or extend the chassis.
That size is about the bottom of the length range for builds on 158-159 inch wheelbase Ford and Chevy cutaways. There once were C's built on the 138-139 inch wheelbase one-ton chassis, with "21" and "22" model numbers, 22 to 26 feet actual length. Won't be any E-450, it doesn't come that short, but the E-350 does. Dealers don't stock them much, as there are few buyers (outside rental companies) for that market.
Check the catalogs. There should be something you can order, Forest River or FourWinds, about 24 feet on 139 wheelbase, a retail version of a rental model. Just don't expect to find these low margin, low demand models in dealer stock.
