We have a RT190P, which we converted to have a real bed. We got tired of that cushion idea, and went to The Original Mattress Factory and had them measure and make two mattress's that are 10" thick and it has been nothing short of super sleeping. We opted for two mattresses knowing that the water pump and electrical connections were on the drivers side. If sometime we need to access those areas, it is much easier to move the one than a whole big mattress...especially if it is raining! It is much easier maneuvering the B around, and you can park almost anywhere and blend in, but not so with the C or others. Safe travels.
