I've worked around hydraulic systems my entire life. I have always been taught that the best way to store a hydraulic cylinder is collapsed. The idea behind it is that the rod is less likely to rust since it will be surrounded by hydraulic fluid. If I was to have to store an RV on it's jacks for a really long time or really corrosive area (by the ocean), I would probably grease the rods to inhibit rust. Just my $.02.
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