My wife is complaining about the original 60x80 Denver Mattress that came with our Open Range. She put a topper on it when new, and I've been fine with it. We haven't bought a conventional mattress ever I think. We had traditional waterbeds for almost 40 years and after I had heart surgery 5 years ago, I couldn't climb in and out of it, so we bought an expensive Sleep Number (personally I think are overrated).
We stopped at Verlo a couple days ago. We will have to special order because of the radiused corners at the foot end. These new ones are several inches thicker and I'm sure heavier. I'm guessing I'll have to replace the struts for the under bed storage with stronger ones.
JK