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looking at your photos of the electrical installation, it looks like there are no bushings in the steel studs you drilled and routed your cable through.....i would strongly suggest adding them....a couple years down the road, the vibration is going to cut through your 12/3 cord insulation....no fun to have a fire inside the walls or ceiling.......or even the remote possibility of the trailer frame/skin becoming energized without tripping a breaker....