[JPizzle]

I run all of my trailer light wiring with extension cords. I try to keep the connections to a minimum on the length of the trailer. All wires are heat shrink butt connector, then coated in liquid electrical tape, and then covered with a heat shrink tube. All light wiring come straight to the yoke of the trailer by the winch where they are then spliced to the plug wire. I dont have any issues this way.

 

[JPizzle]

I got what you are saying, I think you missed what I was trying to say. Where you would normally use the clip to the brown wire, run a full length wire from the side light to the front of the trailer and then splice in there. That way your connection isnt getting wet each time you dunk the trailer. Same thing with the ground. The ground doesn't have to be right at the light fixture which when gets wet can get corrosion between the bolt and the trailer. Run a wire to the front of trailer and have the ground in a dry spot. You might be able to clean your grounds and it be the only problem.

You are going to have more wiring along the trailer beams, but the connections will stay clean. The only other issue would be quality lights which I am sure you are already using.

 

[JPizzle]

You can splice in prior to the front of the trailer if you want with the step down splices just stagger if you want, just more connections. https://www.westmarine.com/buy/ancor--step-down-heat-shrink-butt-connectors--P015982408

Or you can put one of the non metallic electrical boxes and mount on trailer to house a bus bar for the connections. Seems like a lot of excess work but you only have to do it once. I just have my ground by the coupler.
https://www.homedepot.com/p/4-in-x-...C-_-NavPLPHorizontal1_rr-_-NA-_-100404097-_-N