in the mean time, I had a 2005 Titanium 5th wheel that has the same problem. (probably not the same motor, but reading the other thread it sure sounds like it).
I would lube everything, make that slide move easy and see if that don't help.
But in the Titanium they sent me a new slide motor that has a different gear ratio. (the motor would spin more revolutions to move slide each inch)
Because of the ratio change the motor was under less load which caused the clutch to stop skipping.
2022 Ford F150
Sold: 2016 Arctic Fox 990, 2018 Ram 3500, 2011 Open Range
Sold Forest River Forester 2401R Mercedes Benz. when campsites went from $90 to $190 per night.