Re: 3300RLB matress
We replaced our mattress also. Our chiropractor told us to stay away from a mattress that uses springs and go to a full natural rubber mattress. This keeps the chemicals used out of our bed. We checked around to see where we could get a mattress made to our specifications.
We wanted on to be all natural rubber, 8-9" thick and be 71"x80". A King size RV mattress is 72"x80". We wanted a little bit of room to make it easier to pult the mattress out and make up.
After a lot of looking around we found a small business,
Sleep Craft Mattress , that makes mattresses and would make one for us that was about the same cost as a Sleep Number bed. They said they make a lot of beds for Motorhomes and other RV's. When we received the mattress we found that the edges were much firmer than the middle. To find out they said that is was normal to place a firmer foam edge on the sides because people use the mattress as a place to set on when using it as a cushion. The took the mattress back and replaced it with a full foam mattress.
This is a very comfortable bed and has a long warranty. When we decide to exit fulltime we can take the mattress with us if we want to.
I am not sure but I believe they will ship the mattress if needed, but you might look around and see if you can find a small company that will make a custom mattress for you.
Another thing that is a problem with RV Beds it getting sheets for it. When talking to a friend about keeping sheets tucked in by sewing the bottoms into a pocket of both the top and bottom sheets. A suggestion was to buy a regular set of sheets and have them altered to fit the bottom of the mattress.
FWIW
BC