IMO, the best way to keep the batteries charged is via solar panels. If you are going to use the shore power to keep the batteries charged, then you might consider replacing the OE charger/controller with a more sophisticated controller that won't over charge the batteries.
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Steve & C. J.
2008 Carriage Cameo 32SB2; 2019 Ram 3500 6.7L HO
Si vis pacem, para bellum
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