First trip out in our new TT nearly a dozen years ago and our backs were pretty sore after a few days, having a regular size queen all it took was going to a local mattress store to get what felt best. Currently looking for a new TT or 5er and have seen plenty that will accommodate regular size queen and even king mattresses, although many RVs state they have an upgraded residential style mattress I can see they are still just cheap mattresses that will have to be replaced immediately if we want any chance of getting any restorative rest through the night.