If you boondock any at all then 2 series 27 12v batteries would be good... Not as good as 2 6v but better than one battery..
I'd suggest looking at Walmart for your batteries... Good warranty and you can get it done in nearly every little town...
I will probably never boondock but I do use a series 27 Walmart deep cycle... just make sure you buy the DEEP CYCLE and not the Deep cycle / Cranking battery
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2015 Ford F350 DRW 6.7 Diesel XL
2020 Avalanche 313 RS
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