Have you lubricated the cable? I actually had one freeze up on me and it was caused from corrosion. After a considerable amount of effort I was able to get it gliding back and forth smoothly again. I always keep a can of WD40 and lubricate the cables every time after we dump our grey and black tanks.
2019 Keystone Montana 3560RL, 2020 Chevy 2500 HD, Firestone airbags, Air Lift wireless compressor, Curt gooseneck, 20K Reese Goosebox, TST-507, USMC combat vet & retired LEO. Robert, Anika, Breanna, Dylan (daughter-in-law Stephanie). & our Great Pyrenees Layla