We have a '14 and thought we had an issue with front jacks, but come to realize it was only low on hydraulic fluid. The level needs to be between 1/2 inch and 1/4 inch from the fill cap. Fixed our problem.
I believe that the biggest problems have been with leaks on either the lines themselves or the seals in the jacks.
Keep in mind, that many fifth wheels have hydraulic jacks as well.
Personally, I would not let that deter me from a purchase if all else is a plus.
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