I did a LOT of drawings for various little trailers before I ended up buying an old enclosed bike hauler which I'm gonna convert.
Here's one of them:
This was called the MiniCamp. It's just simple line drawings, but I tried to label things. To explain it: It was meant to be built on a 4x8 trailer. The body extended out over the wheels to gain a little extra room, but the bed (located in the rear) was sideways facing. The additional leg room was picked up by having a fold-down door covered with tenting (like a hybrid camper). The inside part of the bed doubled as a forward facing couch. A drop floor was located immediatly in front of the bed (where the door was). The front of the trailer housed a wall-to-wall floor-to-ceiling storage unit. The wall opposite the door had a fold up table. Bring the table up to eat, drop it down while sleeping.