IMHO, a single battery to operate the 12v necessities prior to hooking up to shore power should be adequate. Two batteries are not necessarily needed for solar but I would recommend two if you ever change your mind about dry camping and using solar to charge the batteries.
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2017 Cougar 279RKSWE
2007.5 Dodge Ram 2500 6.7 Cummins
Retirement Training Completed
I think the little voices in my head have started a chat group.
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