Something that may help you is by placing some spacers or Dampeners # 16900 between the hitch and the rails. This will reduce the amount of vertical play your Curt 18K 5th wheel hitch has and prevent it from rocking around inside your rails. view full answer...
It could be some internal parts but it could also be the electrical system itself. The easiest way to know if the internal parts are the issue or not is to use the manual override to see if it will extend and retract without any electricity. If it does then you'll want to check your electrical connections but if it doesn't then it's something internal and you'll need to take the jack apart to see what needs to be replaced.
Should you decide to replace your landing gear I recommend checking... view full answer...