It looks like a flatbed camper sits above the wheels and there is a lot of wasted space below the floor of the flatbed camper.
Does anyone make something similar to a truck camper but is designed to go on a truck without the PU bed? It would sit low like a TC and wouldn't require an expensive flatbed added to the truck first. It would also let the camper use all the space taken up by the PU bed. You would have a narrow portion where the wheel wells are, but it could be 7' wide everywhere else. I imagine it would not be easy to remove and you would loose the basic pickup functionality.
I like the idea a 4x4 RV, but XP camper and a 4x4 sportsmobile are pricey. Is a pickup with a TC the only sub $70K option (new price) if you want 4x4 or AWD.