I am only running two 6V batteries. I would think the truck is delivering plenty of juice to keep the batteries charged enough to keep the frig at the specified temps after 8-10 hours on the road. I personally do not consider 12ga wire to be "SMALL".
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2015 RAM LongHorn Dually Air ride Aisin 4:10's
2016 MS 39TKSB3 "Highly Elited"
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