There are ‘normal’ 60” x 80” queens and there are RV queens, usually about 3-4” shorter. I Purchased a Puffy Full size mattress to replace my RV queen. Puffy mattresses are only sold online but have great reviews. I’m happy with mine - It is 10 inches thick and feels really good. No foam topper required. plus with the full-size I have a little bit of space on either side that I can reach under and get at the cell phone chargers and the electrical outlet. I have to qualify this by saying I am a single man full timer. Don’t know how well that would work for two people sleeping there.
2019 Keystone Cougar 315RLS
2019 Ford F-250 Lariat Crewcab 4x4 Short Bed
2019 Keystone Bullet UltraLite 220RBIwe (traded)
2018 GMC Canyon Denali CrewCab 4x4 Short Bed (traded)
2014 Dutchmen Kodiak 220RBSL (traded)