Hi just took delivery of a 2017 pd31. The unit came with two 12v batteries and an extra tray for two more house batteries. Wondering whether to just add two more twelves or replace all with four 6v Thoughts ? Just to provide more info, this unit has a residential refrigerator ( new for us) so I assume draws more power. We are planning on dry camping so powering the refrigerator is important. Thanks for any advice
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