Burlmart-- Having the Costco 4" queen memory foam topper has made the small height difference disappear. The topper is a pain to stow under the sofa but makes sleeping as comfortable as home. The first time I rolled it up and put bungee cords and straps around it but now I just carry it out to the B+ and feed it under the sofa in a "Z" as it is easier to put under the sofa if not rolled. I now may experiment with a thinner topper from Wally world as a compromise between comfort and easier stowage.