I am looking to purchase an overland/camping vehicle for cross country travel. I'd like to be able to sleep inside the vehicle, so preferably a rv/ambulance/truck w/ slide in camper/etc. I'd love it to be 4wd but understand my budget may limit the options. I'd also like some kind of house battery setup and toilet. I want to leave on this trip sometime over the next couple weeks so finished builds would be ideal. Can fly anywhere in the lower 48.