If you are going to have power available for a charger, instead, just plug the trailer in and leave it powered up. The smart charger in these units will keep your battery healthy all winter long. If you don't have maintenance free batteries, you might want to check them a couple times over the winter.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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