Welcome to the forum 
A bit more information would help. Which GFI? The one in the trailer? Are you plugged into shore power or gen? Any and all details will help in giving you a more informed answer.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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