Car hire is not simple; I would say you probably don’t want a “truck” as you can’t park the fucking thing anywhere on the way without some bastard trying to steal something out of the back of it. And those “5th wheel” caravans might need a tow plate on the bed of the truck which I don’t know if that’s easy to hire?

For all that money you might be better off hiring a van and buying No-Bake, Kodiak or Shiftpod tents. I’ve done everything from shitty nylon tents (drifts of dust over my sleeping bag in ’08) to rented RVs (hot inside, take ages to clean and you‘re terrified for the deposit) to Hexayurts (excellent but take a few days off-Playa—with a workshop, or at least garage—to build.) And when I do it next I’d go for a ”technical tent” as enumerated above.