Apparently Keystone no longer sells that model. Does it have the optional automatic leveling system?
I have manual scissors jacks. The worm drive needs frequent lubrication. Other pivot and sliding surfaces also benefit from frequent lubrication. I use a spray dry lubricant. Grease or oil collects dirt and eventually makes things worse.
I put blocks or boards under the jack pads to help keep them cleaner and away from corrosive contaminants.
I presume the automatic system has the same issues if it uses scissors jacks.
I wish you good luck and happy trails ahead!