Ours is a 2015 RSSA also with wet batteries that I added a quick watering to as above. The AGM batteries are not that much more and eliminate one more thing to do ....
I didn't get the heat pumps as the are roof mounted with vents in the ceiling....Not the best combination in really cold weather. The Cheap Heat system uses the floor vents just like your regular furnace and the heat will rise in the unit and warm everything fairly well.
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