I also thought about if you trade in the Tt you would want to take the house mattress with you to the new one and you could put the old rv mattress in the old TT when you sell it,BUT guess what? the new TT will come with a mattress so you can still put the new TT mattress in the old TT and still keep your house mattress for the New TT. either give it to salvation army or some charity or give to the trash guy to haul away. here at our trash transfer station they use old mattress's as brooms to sweep the trash into the trailer when they haul the trash to the land fills.