Hard to find descriptive title for this lot. If you want to remove all your running gear and still move your van around (almost on a 6 pence) then this is what I used. Very heavy duty wheels from an industrial trolley, one pair fixed and 2 castoring. The timbers shown were placed under chassis rails. You may have to make up some extra wooden or metal bits depending on where you want to place the wheels. Here they are under Lottie Collection only Somerset BA22 8JE. £30
With a bit more timber and welding the wheels were part of a roll over frame I uses in the early part of the project.