Hi all, yes I have read a whole bunch of previous posts on this but I guess I want to ressurrect this question. I have an '07 Viking 2170 pop up with queen bunk ends. Just came back from a Memorial Day weekend and the wife is not happy with the bed. She says it seems to be worse every year ( or we are getting older every year) the mattress seems in descent shape but she has always complained. Tried egg crate foam underneath, sleeping bag cover on top. Has helped but not really. Memory foam is out as a whole mattress replacement as they are sponges and also absorb everything you don't want it to. I saw a poster list a foam site and had memory foam cut for underneath the mattress. So far I think that might be the best option, but what thickness. I,m leaning towards 1 1/2" but don,t know if that will make it too hard to close. I have read about the tissue box test but there should be enough people out there who have played with this to let me know if I'd be good. So I am asking if others have good options and what sizes to stay within. Thanks in advance !