You can have up to 5 in a room at RPR. We are a family of 5 and regularly stay there. 2 adults in the one queen, 2 kids in the other queen and then 15yr old teen on an aerobed we bring with us. You can rent a rollaway for the room at $25.00/night. At least that was the price when I last checked. However, since we use the aerobed, we never request the rollaway.
I have to agree with theterms in that I think a rollaway may make it a bit cramped. With the aerobed, we can just stand it up against the wall. Other than that we have had plenty of room with 2 adults, 2 teens and one 8 year old. Of course, we don't spend much time in our room except to sleep, so that may make a difference too.