I leave all batteries in my Axis (especially the coach since I'd have to tear up the dash to remove it..sigh lovely Thor). I do, however, have them all disconnected and check on them monthly for charge state (if low I run the engine(s) to bring them back up--no plugs where I store it over winter).
I don't have power jacks and thus have, for two winters now, left the coach sit on the tires. Our previous camper, also a 5th wheel, wintered with only the front jacks down for 10 years without issue.
I have covered our Axis every winter so far (which seems to have protected the outside finish).
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