Sorry for the late reply, I haven't been on the forums in a while. I have 2014 30MBS with the queen size murphy bed. I tossed the factory mattress. I added some 1X8" pine boards across the metal frame, then set a sheet of 3/16" plywood on top of that. I then added a 4" memory foam topper, and a 1" memory foam topper. It still folds into the wall and travels just fine, but is much nicer to sleep on.