In the old days we slept in the back of pickups with canopies on them. We would use a Coleman lantern for heat, add some military surplus foam and call it good. People had panel trucks. I had a VW bus for years and slept in it when temps were below zero.
Before I owned a pick-up I used to borrow my brother's 1959 Chevy 2wd drive. It was primer grey with a plywood canopy. We thought that was really something for going on fishing trips.
Now people want fireplaces and washer and dryers.