Too add to the above by JK, you might consider taking a generator or a install solar panels to keep your batteries charged. Like JK states, the furnace fan is a power hog that will deplete your batteries fast.
If you plan to dry camp often, two 6 volt golf cart batteries will last longer than two 12 volt batteries.
Murff
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Murff
2015 White Hawk 20MRB (It's last year)
2017 F150 2.7 Eco Boost 3.73 Gears
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