I've seen a few Ford E350 diesel van conversions and there is 1 that I know of about 50 miles away from me that is 4x4 and has duel rear wheels for pulling a 6 horse trailer. They actually make more seance than a crew cab pickup can still seat the same number of people or more and are 3 to 4 feet shorter plus there is more room in the cab. except for the engine cover.