Mine’s and oldie but a goodie, a 1973 Dodge Travco camper van. 1 ton with the high top and windows all around, the same as a 15 passenger van. It has the 318 engine, gets 15/18 mpg, and is approaching 500k miles on the original engine and transmission. In the 10+ years I’ve owned it, it has needed no major repairs only minimal maintenance, and I’ve put 250k miles on it myself.
I bought it for $750, but the interior had been stripped. The owner discovered they were in way over their head to restore it, so they sold it at a $6k loss to me. Promoters online had convinced them to gut it, toss everything, and start over, even though it was in good shape to start with. I restored the floor, walls, and ceiling from wrecking yards, but wasn’t to interested in restoring the entire original interior. Getting it live in ready cost $200-$300. Not bad for a marvelous house on wheels, and I’ve certainly got considerably more than my moneys worth out of it.
I’ve also had good luck with cheap 70’s Dodge powered motorhomes. Had several for under $1500 that were move in ready when I bought them. These old Dodges just seem to run forever. Decent mpg too.
No sense spending big bucks to do a conversion when it can be done so cheaply, or something move in ready can be bought so cheap. Just steer clear of owner built or modified stuff because never know about the quality or safety of what some non qualified person has done.
"Gutting or stripping a rig is usually a very bad choice." ~ VanLife