I think our mattress topper on our bed at home would bottom out. We got it at Costco a couple years ago, and love it, but I think it might not keep you off the plywood if used by itself.
I hesitate to mention this in a thread talking about a high tech memory foam 4" mattress topper, but... Last summer we were camping in Chincoteague and found a $10 3/4" cheapo egg-crate foam mattress topper at the Family Dollar store. It is really a great improvement, just enough to soften the standard TM mattress a little, and not thick enough to be a problem with clearance when the shell comes down!
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2005 TrailManor 3023
2003 Toyota Highlander 220hp V6 FWD
Reese 1000# round bar Weight Distributing Hitch
Prodigy brake controller.
"It's not how fast you can go, it's how fast you can stop an RV that counts."
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