I agree with SeaDog.
We have a 2021 192 RBS. Kept the original mattress and added a foam top. The original is a full size queen. Wouldn't think there's much difference in weigh unless you got something bizarre like an adjustable bed that lifts your head and feet. But that would be a whole different set of issues.
2021 Freedom Express 192RBS
2020 F150 STX 4X4 w/Coyote V8
Centerline TS WDH
2004 Heritage Softtail Harley Davidson