Not fiberglass, at least not molded fiberglass, but a neat sleeping place at least: http://swamplot.com/faro-out-extra-vehicle...ets/2009-08-17/
Addendum
Steve DeWeese: Would not want to go this route as well. I would not want to go without my shower & the head, or the frig, etc. But an interesting concept, especially the beds & table at the "foot". When I started out camping, I would have been a happy camper with one.
As for the looks of the trailer, I like it, very neat looking, good design to it.