We bought a memory foam with "cooling" gel beads in it from costco to put on top of the rv mattress. I like almost as much as our $1000 serta mattress in the house.
2008 Chevy Silverado 1500 5.3/ 3.73 Tekonsha Primus brake controller
2011 JayFeather Select 29L
Husky Centerline WDH
w/ active anti-sway