Recently my steps failed to operate on my Tiffin Phaeton. Service suggested hitting the motor with a hammer but that did not help. Tiffin sent a new motor. After I changed it, I took the old one apart and found the design failure in the Kwickee design. It is easy to fix and will save you from buying a new step motor.
The Kwickee motor has some play and the commutator can move up and wear the plastic brush holder causing the brushes to stick away from the commutator and the motor will not run. If you remove the motor and carefully lift off the plastic brush holder, you can carefully use a pen knife to remove the interfering plastic. Once you seee that the brushes are free and move smoothly, carefully replace the brush holder on the motor can (take exreme care in holding the brushes bach as you slide the holder down over the commutator)
and reassemble the motor to the step acutator. You should be good for another year or so of operation.