I'd definitely look into one or two solar panels on the roof to recharge your batteries.
A 40 watt panel / 12v = 3 amps. I am guessing you might need two or possibly three since you are into boondocking, with a charge controller. There are some youtube videos on installing and run wire down grey water tank vent just drill hole in side of it and caulk the crap out of that end.
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