I like this idea! An ultralite camper....
I dont want one that is a boat either. I had in mind one that is a shell and a boat slides into, becoming the floor and fixtures. However when pulled out of the camper ( like docking ) there is still a deck on the trailer bottom you can easily sleep on and fold down counter space on the walls that fold down as the boat gets pulled out. Im thinking 14 foot long at most and flat bottom. Simple and effective.