I bought a 5 1/2' x 8' cargo trailor, built some removable bunk beds, insulated the interior with carpet padding. This works great and saves a ton of money.
I take it to NY hunting (about 80 miles north)and park right in the game lands. I have a Honda 2000 generator for heating needs and coffee pot and it's very quiet. No windows for heat loss. Granted, I wouldn't want to live in this thing but I intend to spend most of the time outside anyhow - just sleep inside. Warm, dry and secure.
Recently my father and I took it to Gettysburg for the week of re-enactment (spectator), Oh, did I mention I have a small air-conditioner too? Really needed it too - July is pretty hot down there. Only cost $40 for the week of lodging - much cheaper than a motel. I think the lady even felt bad charging me for a full lot with something so small.It tows great - don't even know it's there.
When I go to rendezvous, I set up my hand sewn lean-to in the primative section and hang out there most of the day but return to the trailor for sleeping and eating. I'm a fat boy and don't enjoy sleeping in a pool of sweat. It's cheap, and comfortable.
Just had it loaded with my livingroom furniture yesterday for moving - try that in a pop-up camper. Can take the bunks out and haul my four-wheeler too. Happy camping!