As far as the batteries are concerned, as long as the RV stays plugged in it's no different than when you're there - so just leave everything the way it normally is.
Personally I would close the roof vents and leave the AC on the same as I would at home when I leave for a vacation. Maybe set it to a higher temp than you normally keep it, but let it keep controlling the heat and humidity inside the RV. And it will also keep the refrigerator from having to work so hard to stay cool.
2013 Winnebago Sightseer 36V