These are pretty neat - I have a friend who owns one.
Coupl'a notes though:
1) They're not molded fiberglass - they're mostly metal
2) The puck is really small -- it makes a Boler
13 look HUGE. I would guess the beds are about 5'8" long (one is shorter but has a flap that folds down in front of the doorway to make it longer).
Check out the floor as it's plywood and may have rot. I believe the "stick" type frame is metal.