When I have coach stored the jacks are up if I were to extend a slide I would put jacks down.
If stored for extended periods some inflate their tires to sidewall psi on tires just have noted someplace what your traveling pressures are.
I also have coach plugged into 110-120 outlet for winter with battery cut off switch on so Bird System
can keep batteries fully charged.
If you have wet cells check the water levels during storage so plates are covered with water, some people place mineral oil on top of water to eliminate gasses.
If you have AGM's as I do no need to worry.
Exercise the Gen and AC's once a month to keep everything operational.
In my signature below are links to many others for you Newmar.