RV Queen mattresses are shorter in length by design, usually by about five inches.
They're not made for tall people, I guess.
If you put a standard Queen mattress in place of an RV Queen, it's going to hang over.
One of the best upgrades we've made was to have an RV custom-size euro-top mattress built for our little trailer. It's about a foot thick, and I sleep very comfortably.
As the sales-gal told my wife, "You're on vacation. You want a great night's sleep!"
2004 Terry 250RKS, perfect for the two of us and the pups. It recently replaced our Flagstaff 21FB.
2000 F-350 7.3L CC/LB 4WD Lariat 3:73's