my sore back!!
Hertig is right about this foam top really working. I have a memory foam regular mattress at home, and this enabled me to sleep well in the RV when I added the one that I bought at Costco on line. I do not remember the model name or the exact cost, but it was the smooth surface one, no egg crate top or ripples. It does come shipped vacuumed packed and takes a few days to smooth out, but really works. Sorry that I could not help more.
buckbs