I too recommend a deluxe Room at the Hard Rock over renting a roll-away for a regular room.
The deluxe room is much larger, and the price difference between the regular room w/ rollaway vs. deluxe room will be minimal.
My sis and I paid $155 plus tax in March for the deluxe using the Entertainment discount. 2 adults, 1 teen, 8yo, 7yo. The regular room with rollaway rental would have been $150 plus tax.