On my brother in laws Monaco Dynasty he had the same problem. We found the motor to be burned out. A replacement motor from the manufacturer was a few hundred dollars. A poster here told me that the motor I needed was
the same as an electric window motor from a certain model Ford. A call to NAPA and 45 dollars later it has worked fine. Hopefully you have someone other than a rip off RV dealer that you trust, maybe a backyard mechanic that
can crawl under there and unhook that motor arm for you so you can use it manually until you get to a place down South. I haven't seen a picture of the step you speak of but my experience has shown them to be very similar.
A motor needs to power the arm to go in or out, depending on how the motor is mounted it could have the arm go up or down, as is the case in a power window. I wish you the best and hope you find a mechanic to help you.
