On aircraft we have hydraulic cylinders exposed to the elements all the time.. we usually take hydraulic fluid and wipe it down once a week and it keeps them from rusting. If you use oil or grease, That can latch on to grit and grime and hold it on the cylinder unless you wipe it down before closing slide... I think wiping down with WD-40 is ok but I wouldn't use any grease. Oh WD-40 displaces water too. Just my opinion. happy camping!
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