use hydraulic lifts down or up in winter for storeing

All of the people that come South for the Winter use their jacks 24/7 to keep their coaches level during their entire stay. Using the jacks during storage is actually easier on the jacks since the coach is not loaded as much as it would be when parked while being lived in.
I agree that there is no reason to lift a tire off of the ground but using the jacks to take some of the weight off of the tires and suspension components will not cause any harm.