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They have had a lot of problems with this system. It may be that this one leg is way too heavy for the load, based on the design and placement of the interior walls, slides and equipment. This is a common problem where the designs look good on paper, but nobody checked them out to see if the floorplan would make a difference. Have you talked to Tiffin about the problem?
I don't think replacing the jack is going to change the outcome, but I would have it checked to be sure something isn't bent or jammed in there and causing this. Find out if any other Tiffin units have been having issues with this jack.
Just checking back in to see if you were able to resolve this issue or do you still need more input from me here?
I think a call to Tiffin would be in order........