I just bought a 7'x14' trailer with intentions of turning it into a "poor man's toy hauler". I'm looking at beds that fold up against the wall on each side. I'm surprised at what these things for for. It seems like $600-$800 each is the norm. Has anyone found a cheaper option? I'm not against home made either. I've already finished the floors and walls. Any other tips or tricks for making these things livable?