I think you can replace that 30 amp breaker with a 30 amp gfi breaker in the box if you wanted to. That would protect everything from the box on down. By doing it at the post it would also protect your cord I suppose.
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'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
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