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Tsal I had a similar problem with the batteries getting very low even with the charge working from the trucks battery on the 7 pin power cord.
I resolved it by installing a Renogy 40 amp DC to DC charger from Amazon. The 20 amp model may be on black Friday sale for around $100. and it may be all you need. It will manage how much power goes into your camper batteries not allowing more than the stated amperage which is really beneficial especially if you ever switch to lithium batteries.
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