Hello all, I know there are a bunch of you out there who take your quilting along with you in your RV or camper; so I thought I'd put my question to you here on the board. The mattress in my camper is extremely firm. Firm to the point of pain, after 4-6 hours in the bed. We can't afford to buy a whole new mattress. What I'm looking for is some advice on something else we may be able to put on top of the mattress to sofften it up a bit. I don't put a lot of stock in those foam things (sort of "corrugated") that you can buy in Wal-Mart, etc. We have one of those on our regular bed (which even has a pillow top), and I'm not so sure it helps that much. If there is a particular type of foam or some other material that is available, what exactly do any of you recommend? What density is it? what material is it? what price range are we talking about? I also don't need to add height to the bed. It's already plenty high. Thank you all so much for your input.