You might want to look at the cable end inside the camping unit. I was able to help a couple that had the same issue and a bolt had come out of the gear that winds the cable. We got it back in a replaced a missing cotter pin.
2000 F250SD SRW 7.3 Long Bed Extended Cab Air Bags
2014 Eagle 30.5BHLT
2007 Layton 245LF (sold)
196? Shasta 16ft
Learn from others mistakes, you'll never live long enough to make them all yourself.