I built a fully removable camper for my Chrysler Pacifica 2020 AWD that sleeps 4 with two in a GFC roof top tent and two inside on a full sized bed with memory foam mattress. There’s a full kitchen with faucet, microwave, 40L Iceco refrigerator, and even a toilet. We used this on a 3 week, 7,000 mile roadtrip across the US and its worked great. I hope this serves as inspiration for your own build!