Jayco Simmons Residential Mattress

That was one of our first mods after purchasing our rig, since it was a full size queen we just went to a local mattress factory and had one built to our specs. I guess you lucked out with your prior rig as I've never heard anyone state they liked the stock mattress in their RV before. I've seen videos of RVs where the salesperson states emphatically their RVs are ordered with so called residential mattresses only to find it is just a bunch of hype with few exceptions. Not sure what else you can do if the topper didn't alleviate the issue other than full replacement.