Dual Battery in my 5th wheel.
I have two battery compartments in my 5th wheel. However, only one has the batter connections coming from it. An I simply add the second batter and connect to the same posts that my other batter are...
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Regardless of which (12v parallel or 6v series) system you pick, it is recommended to start out with new, mathching batteries. I don't have room for 6v batteries. So, I went with 2 x 12v Interstate marine batteries from Costco and I'm very satisfied. A solar charging system to keep them maintained is a good idea as well.
