Welcome to the forum 
Is your trailer 30 amp or 50 amp service. 30A is 3 prong, 50A is 4 prong plug. If it’s 30a then no, there isn’t any wiring at the bedroom vent. If it’s a 50A then simply take the inside ring down and look for Romex.
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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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