Oh yes, please do not raise or lower the roof plugged into 120v AC power, according to the manufacturer.
The official warning label from Fleetwood that was added to PUPs after the issue was firmly documented reads:
DO NOT OPERATE THE POWERED ROOF LIFT WITH THE TRAILER'S POWER CORD PLUGGED INTO ANY 110VAC POWER SOURCE. USE A 12VDC BATTERY SOURCE ONLY TO OPERATE THE POWERED ROOF LIFT ACCESSORY.
IF OPERATED WITH 110VAC, THE TRAILER CONVERTER WILL NOT SUPPLY SUFFICIENT VOLTAGE WHICH COULD DAMAGE COMPONENTS IN THE LIFT MECHANISM; RESULTING IN THE POTENTIAL FALL OF THE ROOF.
FAILURE TO COMPLY WITH THIS OPERATION REQUIREMENT MAY RESULT IN PERSONAL INJURY, VEHICLE AND/OR OTHER PROPERTY DAMAGE."
(Part # 4768-191)