I went to two batteries (12V since we do not boondock), with a isolator switch. This lets me use one or the other or both. We needed the extra since we have to turn rig on the day before to cool fridge, then when it draws the battery down, I have a reserve battery to start our built-in generator to charge the batteries. I always have a full battery this way to operate the Level-up, slides, etc. Our solution may be overkill for your application but it works well for us!
Bingo
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Bingo and Cathy - Our adventures begin in the hills of WV. We are blessed by our 2014 3850FL Big Sky (previous 2011 3750FL and 2007 3400RL) that we pull with a 2007 Chevy Silverado Classic DRW CC dually.
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