I just bought a Trail Lite B+ 211s with 8.1 Chevy engine. This is my fifth motorhome (others range from an old 20' Vagabond, and three Winnegagos, from 19 to 32'. This vehicle is fantastic. I am...
We also store a 1/4" piece of plywood under the one dinette seat. Once all the cushions are in place, we lay that across the cushions to "even out" the surface and to keep us from "sinking into" the cracks/voids. We throw a thin blanket over that to protect the air mattress and then put the mattress on top. It does a decent job now. I have back problems and this seem to help me get a good night's sleep.