I live in Southern California and a lot of folks head south of the border, which if you want remote camping, a 4WD is needed. This basic camper suits offroad camping well as it is not super heavy. Going to the beach around here, you see this type of camper frequently.
The floor is the truck bed and in my case, has a rubber floor insert over Line-ex bed spray. So yes, it is basically a large truck topper/camper. I have insulated the walls and roof with 1 inch foam, covered with vinyl covered board for the interior. Right now it is just a shell but I do plan to make easily removable amenities. I didn't want the hassle of removing the camper to haul stuff, etc so the back doors are full width. I have been using this for about a year now and love it. I've camped in Colorado, Utah, California in all weather conditions and offroad it regularly...and, been using it to make yard waste dump runs too. I can just sweep or hose it out when done and back to camping mode. I am hoping to finalize the plans within the next few months. Not going to lie...my kids activities have kept me very busy the last few months! I see you are in Idaho! I was in Nampa for xmas...with the camper...this time carrying all the xmas crap and the dogs!