One concern I have about the bed (and this could be -completely- unfounded) -- the rail it rests on doesn't seem to be that thick. If there is some play between the hinge part of the bed, the bed could fall down on that side, and possibly snap the hinge, as well as provide a rude awakening to whomever is on top of it.
This probably isn't an issue, as Winnebago does a very good job at engineering, but it got me wondering about that. Not hard to fix -- add a 2x4 every couple of feet before putting in the bathroom fiberglass.