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I cary a seperate battery in the bed of the truck and keep it always charged thruogh the fifth wheel connector IN the bed of the truck. When the fifth wheel is attached the battery is discunnected then re connected when the trailer is parked. If the trailer batteries get low I connect the trailer cord to the BUMPER connector and the third battery helps out. If I go fishing, hunting, hiking in the truck the battery gets recharged while driving. If I plan to be a long time between charges I plug the trailer in to the bumper plug every night. I also have a large solar panel on the roof of the trailer. Have never run out of charge.
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