Here's what I do in N.E. Ohio:
1.) Start the coach in the driveway and let her run for 45 minutes. During this time, I give it an occaisional little rev up to 2500 rpm, say every 5 minutes or so.
2.) With the coach engine running, make sure I turned the coach battery disconnect ON so the coach batteries are getting charged. After 5 or 10 minutes, I then start the generator.
3.) With the genny warmed up after say 3 minutes or so, I give it a "load". I plug in a couple of small 1500W electric heaters in the coach and let them heat up the interior for the rest of the 45 minute "exercise".
Granted it's probably better to take the coach out on the road than to run it in the driveway, but mine is tarped as well and I will not take it out in the Ohio salt.
And I've bought a Battery Minder to put on the chassis engine battery; this type of "smart" charger can run 24/7 and maintain your batteries properly without fear of boiling them dry. -That's something your in-house charger cannot do.
I do not run the slides and do not store with the jacks extended. I park with 2 x 10 pieces of wood under the tires.
I leave the roof vents open (they're under covers, and I leave 3 or 4 slider windows cracked open about 1". Never had issues with snow/sleet/etc. coming in and it does help circulate air within the closed coach.
That's it. Just remember to turn off the coach batteries after you've done your 45 minute "exercise".
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