I made one of these a few years ago (shown below in Blue) I had intended to make another (it takes about a weekend) but no longer have the time or facility. So here it is, the back end of a VW Caddy Van, free to collector, it rolls freely, handbrake is re-usable, would look well cool on the back of your Bus. It also pre-dates trailer type approval period as well. ;-) I may have the steel to make the T piece and I even think I have the key for the lock on the doors. The Blue one shows how I did it. If you want it (and are serious) call dibs ON HERE, that way I don't get PM's superceding, emails and/or anything else.