I've had back surgery 6 times, I'm glad I seen this posting. We bought a bed from JC Penny's just by filling out the questionnaire and the mattress was great. We also have an RV, hubby bought a tempur pedic mattress topper for the bed we sleep in, it hurt my back so he bought another to put on top of the 1st one. It's better but not great. so after reading these responses I might look into a sleep number mattress for our RV. Not sure if they make them or not but it's worth a try. I'm still amazed that I could fill out a questionnaire from Penny's and get a comfortable bed!