I have friends in Florida who built a houseboat that doubles as a camper. They sometimes spend a few days on the water, or when we go down there, they pull it into an Ocala National Forest campsite and camp next to us. (Back in the 70's they built a sailboat.)
It does not have a bathroom, though. Just a porta-potty.
I bet they'd kill for an egg houseboat! Gonna send them the photo!