Well, I finally decided to start small/cheap. We purchased a memory foam topper from Costco that happened to be on sale that weekend, so only cost $122! We've slept on it now for about 2 weeks, and it is a big improvement over the original mattress.
It does bunch up when we pull the slides in, but settles right down when the slides are out again. I was worried that all of the sheets & blankets would all be pulled out when the topper bunched up, but it doesn't seem to affect that much at all.
So, we're happy for now, but longer term, I like the sound of Wally501's mattress. We'll see how it goes....
Gail, John & Mindy Stacy
2007 Alpine SE 40FDQS, 2011 Equinox
ACA & Alpine SoCal