Why don't you use your three-prong monitor to confirm that there are no faults at the exterior outlet and then connect your trailer? In most cases a fault in a shore power outlet would already be present, so checking the exterior outlet before connecting your trailer makes sense. Rarely would you find a shore power fault occur after connecting to shore power - with the exception of high and low voltage surges.
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Al, K6IV
2015 30' Classic, "Chez Nu"
2014 RAM 2500 w/Cummins Diesel
ProPride Hitch, 400 W Solar
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