We don't camp off of the grid either so that sounds like a 12v source for me if I want to add some additional LEDs outside. If everything else in the camper is off, I don't think you'd gain anything using an additional charger vs. just plugging in the shore power cord. The camper has a built in charger to keep the battery charged up. You'd probably never notice the difference in draw.
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2014 Grey Wolf 26BH
2013 Toyota Tundra 4x4 DoubleCab 5.7
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