I think I would check directly with Jayco about this, I find it hard to believe there isn't a way to manually raise/lower the roof. To many things that could go wrong. We dry camped several times and I would think using battery power to run the motor would use a fair amount of juice. Often times, our battery was about done when we were ready to leave and wouldn't have enough left in it to run that motor. And, there is always the possibility of the motor frying out on you. I honestly wouldn't buy one with a power lift if it did not have a manual option. Do you have an opening for a crank handle?
2013 Starcraft Travel Star 229TB
2011 Jayco X17Z(traded in)
2010 Jayco Jay Series 1207(traded for the 17Z)
2011 Chevrolet Silverado 2500HD Z71 CC 6.0L/3.73
Reese "Pro Series" 800lb Trunnion WDH w/sway control