Had to get this out of my head, I don't actually see myself doing anything like it in near future, it's just got novelty, "wouldn't it be cool if" value for me at the moment. Sometime I might be tempted to actualise it, just to see it.
Top down view of the "coach"

So it would be about 2'8" wide, and the pullouts would make a full size double bed sleeping area. The rear would be a "half clamshell" kitchen, with the upper side on the drawing opening 90 degrees to make a 90 degree corner galley.
It would however be quite long, maybe squeeze it into 10ft.
I don't know what it's "for" at the moment, maybe if you've got a Goldwing and want something different? But crosswinds cold wag you around a bit.
Though the thought occurs that it might even be adaptable to a bicycle.
Then that thought leads to me thinking, why have the bicycle outside, make it into a tandem recliner RV!!! With that I think tricycle, so you don't have to whip a leg out to balance it. I'm thinking you could make a low riding recliner bike that basically just has seat(s) sticking up any, that could be flipped/tumbled/folded down to allow the floor to seat. In vertical profile you can make it pretty durn slippy too I would think, possibly get up to impressive speeds.
With the pedal driven RV idea though, I think it might have more canvas in the pullouts. Though also they might be fold and pull on that idea.
Anyway, all it is at the moment is a brain unload.
Jagged Edges.