These Atwood camper jacks must be 9 years old now. One refused to budge today and using the manual crank was nearly impossible. I removed the motor off the head and the jack screw now works fine, so...
You should be able to get it rebuilt at an electric motor rewind shop. It would be cheaper than a new motor. I had a 12V trim motor repaired for my boat a few years ago and was several hundred dollars cheaper than a new one. JMO