We went to BedZZZ Express and ordered a residential mattress. After 2 years of hunting, we just happen to stop in here and asked if the carry any mattresses that are 72x80. First question from them was was this for an rv and we said yes. The saleman also owns an rv and knew the problem that we were having. One of his companies does specialty orders and he also replaced his camper mattress with this one. It's called King Koil Port Charles Lux Firm King. The price was a little over $800 which tickled me pink. Even tho the mattress is 11" thick, it still works well getting into the under bed storage lift platform.