Re: sleeper sofa
Oddly enough, the flip down bed in my cheapo fifth wheel was very comfortable, but the one in the fancy coach is unusable. Part of the problem is the 'fancy' one has arms, which make it too short for many to use. Also, there seems to be a major 'ridge' down the middle when flopped down. I'm planning on replacing it one of these days, but in the meantime, people who sleep on it do it in couch mode, which is not too bad (if they fit on it).
Tried an air mattress, but did not work with the arms. Another option I might try is to make the arms removable and use the self inflating air mattress when sleeping on the couch.