We had a 2 bedroom unit at GM-NV last Easter. I was surprised at the amount of potential beds in the unit. Both of the bedrooms had king sized beds (very hard mattresses, as per usual in Mexico). Both the bedrooms also had the pull out sofa beds in the bedrooms.....and honestly if I was to have a teenager (or even a normal sized adult) sleep on the sofas, I would use the sofa itself (which was really more of a daybed than a sofa) and not the trundle bed part of it since the sofa was very large and comfortable (basically almost a twin size....look at the photos and you'll see how deep the sofas are) as a bed (not so comfortable as a sofa). Then in the living room, there were TWO of these sofa beds.
So in all, the 2 bedroom units have 2 king size beds, and a total of 4 sofa beds. You don't need a roll-away bed!