We had a queen specially made to the measurements of the bed area in the 5er. We did that after the trailer was broken into and the bedding, including the memory foam topper was taken. It was made by the company that we bought our first queen size mattress from, when we moved into this house. We really like that mattress so they asked for the model number that was still on the old mattress and built it to our measurements. Sadly they have since closed down. It wasn't cheap but it sure is nice to sleep on a great mattress.