That Romahome sure is cute.
I was told that the portapotty was designed to be set up in the back of the truck - when you set up camp, you'd slightly lift the camper, pull the truck ahead a few feet, then place the potty in the space between the cab and camper body, and install curtains for privacy.
Biggest drawback is the anemic power in the truck, I guess - they're only good for 50 - 60 mph on the highway, and less in the hills from whay I understand.