For serious expedition style campers, maybe a tool bed or a flat bed is practical. I think the Turtle guys went that way, more or less. Europeans, the few who can afford truck campers, seem to have heavier diesel powered espedition trucks. For the rest of us with day jobs, pickup trucks are the way to go, either full size or compact.
I like heavier off road campers, like the Alaskan. I use to own one and I still have the one ton Power Wagon with Dana 70s front and rear with utility bed that carried it. The direction you are going is toward a previously invented wheel, the Alaskan with a utility bed. Trust me, for the average couple wanting to go off road, lighter is better.
Second Subject - AutoCAD and CAD in general - DD, you might consider establishing a subject catgory for CAD users here on Wander The West. It takes CAD software to view design efforts done with CAD programs. There is a great deal of cross compatibility in the CAD world and it could be an asset to Wander The West to have a place where CAD users post their design efforts. A group design effort could be hosted with a committee to decide when changes would be made to master designs, both heavy and light. As these evolved, someone would probably build these campers.
John D