Interesting setup. You may want to check the current draw on each battery with all loads off. If it's below 25 milliamps on either one, you don't really need a cut off on that one.
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2019 Coachmen Freedom Express 192RBS
2015 T12RBST Flagstaff Hardside
Disclaimer: The actual value of my "Two Cents" of advice varies just like a bitcoin.
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