I think from a cost-perspective, that would make the camper or trailer too expensive. Now, if they could utilize the trailer as a battery backup with built-in grid-tie, that would be interesting.While you can't zero out the trailer's weight behind the cybertruck, what about a single motor and, say 100mwh battery with regen set up when brakes are applied rather than a standard trailer brake? If the trailer could "push" half it's weight for the 200 or so miles we hope to get out of the Cybertruck, it would be awesome. And yes, cover that top with solar panels to help when dry docking and just keeping things charging and running at all times.
I have no problem with the bed area... it's like all 5th wheels (well, a lot of them) where you have to duck when up there if you are over 6' tall like I am.