Thats the same issue I had, the motor brakes would not release when the power was disconnected. I was stuck on the road when this happened and discovered the fix by talking to a factory rep that just so happened to be at the dealership I purchased it from. Its a little heart wrenching pulling the gasket material from the camper to get to the motors, but that's what I had to do to get it back on the road.
2012 Crusader 320RLT
2011 F250 Lariat 6.7L
2016 (19 Nights Camped/1348 Miles)
2015 (38 Nights Camped/3560 Miles)
2014 (28 Nights Camped/1980 Miles)
2013 (30 Nights Camped/1411 Miles)