The only commercially produced bicycle camper that I'm aware of in the USA is the Kamp Rite Bushtrekka (
Here's Amazon's link to it.) It sleeps one, and it's basically the same as their cot-tent, only with wheels.
It just seems to be a lot of weight for a tent-cot combo? Hammock camping and tent camping are both a lot more lightweight and compact, fit into less expensive cargo trailers, and store more easily. Granted getting off of the ground is nice, but check out hammock camping--it's a great idea for anywhere except treeless regions.