Drill the hole out a bit bigger where the cable slides through so it won't rub. Then insert a rubber boot into the bigger hole, or cover it real good with a rubberized or silicon calking. Let the calking dry then run the cable in and out. It will open a new path and keep the hole sealed. Because the hole is now bigger, and the end crimped catch will not hit anything any more, it should not fray again.
2019 Montana High Country 375FL Fifth Wheel
2014 Chevy Silverado, 3500 Dually, long bed, crew cab