Same trailer except the 21RBS version. Been in the 22RBS’s recently see no difference. Yes the original mattress is awful. We got the thickest best King memory foam topper we could find, and got a deal at Kohl’s with coupons. Cut to fit like many have said with a Ginsu
. Very, very comfortable now. Heavy, yes. Had to do some reinforcement of the frame at the foot that opens for storage. Cheesy 2x2 construction. I get it. I bought an XLite. Used to be in aerospace, so when it comes to weight, it all adds up. I left the original framework and just reinforced it with metal deck accessories from Home Depot. Very strong now and added little weight. In reality, I suggest anybody with our trailer do that as preventive maintenance. Mine had started to come apart after some rough roads and made the repair a little more difficult. Do it while it’s still all together and it will be a very easy upgrade.