Yes. Though i understand your concern about the weight of the camper being pushed to the downhill side during flex, you can see in my photo above that is true. My 2-point system keeps the load spread across the entire length of the truck frame rather than focusing the mass at 2 attachment points which 3 and 4 point methods do. 3 and 4 point systems obviously work but they need to be engineered for each truck frame. An 'all spring' system also will work reliably without engineering.
Anyway I think we've taken over this post and I'ld like to hear from FutureExpitioner if he feels like his question has been addressed.
I think a "rigid" camper on the bed could only work on smaller/lighter vehicles like the Tiger Bengal. Any larger vehicle like an Earthroamer would surely need the flex of a 3-point system or the shell wouldn't last very long.