My friend and I have discussed this a few times, just a little different and if we had deeper pockets. We'd take a slide in truck camper, like one that goes in the back of the bed, mount it on a big 5th wheel trailer and have your Jeep behind the camper shell with a regular length (16') or so for it to sit on.
Last year at Chocco Danny and Adam both set up tents on his trailer. Just looks like a tent on a trailer lol. If you have power and want to be comfortable I'd bring an air mattress or several pads to sleep on if that a big deal.
I'll look through some pics and see if there are any of various set ups.
I have a real good idea for you, just wait.