There is no need to unplug it when you see there are problems with the power - that's the job of the EMS. It will keep your trailer disconnected from power until it feels it is safe. Just leave it plugged in and let it do it's job 
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2022 Cedar Creek Champagne 38EL - "Big Bertha"
2019 GMC Sierra 3500 Denali HD 6.6L Duramax TD, CC, 4WD, DRW - "Mr. Beefy"
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