I love having reverse lights. They should be a standard feature on all trailers, or at least an option.
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Attached lights to the 2x2 square channel that the hitch is welded to. They are safe there because the hitch's square mounting channel protects them.
Ran a 14ga wire inside 1/4" split loom from front to back attaching it to the bbq gas line using the existing clamps plus a few zip ties. Grounded the negative to the frame at the back and covered it in liquid black tape from the Depot. (I love that stuff)
Brought wire up the gas line into the propane tank compartment and covered with split loom.
Sent the wire through the floor under the bed through the existing hole that the slide wires go through. Tuck the wire behind the carpeted wire chase towards the left side of the closet.
There is an existing hole going through the closet wall at the bottom left. Then ran wire up behind the wall panel and out at the bottom shelf level.
Put split loom on the wire and some clamps, and ran it under the shelf and though the handy space they left on top of the panel into the front cap area.
Took out front shelving unit (it's all one piece with some screws holding it in) and brought the wire to the center area of the cap.
Reach under the floor and feel for the front side of the hitch mount. There is a couple other wires going out there too. Fish the wire though the little gap/rubber weather stripping into the pin box mount area
Follow the 7 way trailer wire through the side of the pin box mount and fish the wire out the 2" hole behind the light beside the pin box. Pull out the 7 way wires and locate the yellow wire that is capped with a wire nut. (That is the middle reverse light pin of the 7 way connector). That is the connection point for the reverse lights.