I was trying to figure out the same thing and this is what I was told:
You can get a roll-away at RPH. It is $25 a night. If there is more than two adults in the room, there will be an extra charge of $25 per night. With the Entertainment rate that was going to make my rate $160/nt.
At HRH I was able to get a Deluxe Queen room with 2 queen beds and a foldout sofa for $185 a night Entertainment rate. There was no extra charge for the adult in this room and no need for the roll-away. And this room is 165 sq ft larger than the room at RPH. We will have 3 adults, an 8 yr old and a 15 yr old who is as big as the adults, so we took this option for the additional room.
Hope this helps some.