Mine had issues the bedroom unit had an unbalanced fan blade the living room unit had an untrue fan motor shaft the dealer replaced the fan motor in the LR and put stick on weights on the bedroom it helped a little but anything over low makes the roof and walls vibrate, they gave me the old industry standard answer.
06 3500 Laramie Dodge Mega Cab 4x4 5.9CTD Short Bed Dually
13 Sandpiper 365SAQ Fifth Wheel
05 Chevrolet Tahoe
93 F-250 XLT 4x4 Diesel Banks Sidewinder (gone but not forgotten)
79 Jeep CJ-7
77 F-250 Crew Cab Short Bed 4x4