We have the Flagstaff 8528BHWS which is the sister to the Rockwood but with the closet slide in the master bedroom. It is a 30 amp and we upgraded to the 15,000 btu AC. We have yet to take it on the maiden voyage and will let you know how it does in this Missouri heat wave. Unfortunately it will be a few weeks before we can but I do know we weren't given the option to have a second AC installed when we ordered it. Just the option to upgrade.
2005 Chevy 2500HD
2013 Flagstaff 8528BHWS