You've evidently read my earlier posts about putting the 3" MF (Memory Foam) mattress topper underneath
the Denver mattress - like a box spring. Doing this eliminates the problems others have described: too warm, trapping moisture, slow response, feeling the plywood under the mattress. I trimmed the 3" MF to fit the short-queen length with an electric carving knife.
Since my trailer is a 2013, it didn't come with the Denver Pillow Top; just the standard Denver Mattress. I also put a 1" corrugated foam rubber mattress topper on top
of my mattress to make it a pillow top. This combination is the most comfortable mattress I've ever slept on!
Since you already have the pillow top, you won't need the extra 1" corrugated foam on top. Just a standard mattress pad/cover.
I full-time, so I sleep on my bed every night. After 6 months, the mattress did develop a sag where I sleep. I just turned it 180 degrees, so now, the sag is under the dog. (He doesn't seem to mind.) When the next six months is up, I'll flip the mattress over, and check to see if the MF needs to be flipped, as well. Just like you'd do with your mattress at home.
I'd strongly urge all those who don't like the Denver Mattress, and who aren't happy with memory foam on top, to give memory foam under the mattress a try. What have you got to lose?