Since your rig is a newer one (based on previous posts), it is equipped with a multi-stage charger (you can verify this). The multi-stage charger will adjust the charge accordingly therefore there is no harm in leaving the batteries turned on. I do the same thing with our boat, the boat is plugged up all winter long with the battery bank being serviced by a multi-stage charger.
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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