[quote=mattson]I once had an 8 ft length of gutter downspout that I mounted tail lights to, and would bungee it to the rear crossbar when trailering. For the wires, I pulled them into some small rubber tubing to prevent tangles. This can be removed when launching and the lights never get near the water.
I have since mounted LED submersible taillights to the trailer, on mounts that are slightly elevated, keeping them out of the water. For the sidelights, I measured the ID of the square tubing of the cross bars that support the hulls. I made a square mold out of telfon cutting board material, with two holes at the bottom for the wiring. I added a good ten feet or so of leads to the lights, pulled the wires through the bottom of the mold, sprayed the mold with some oil as a release agent, suspended LED side lights in the mold, then flooded the mold with thickened epoxy, until the level reached the plastic lens.
In the end I had a light that had the entire back (and wiring connections) encased in a square block of epoxy that I could tap into the end of the square tube. All wires for each light run all the way to the front of the trailer with no connections. This would not be practical for incandescent bulbs as it would prevent replacement. But LEDs don't require replacing for years.
The only dicey part of the project was the heat from the block of curing epoxy. When hard enough, I put the assembly in water to cool it down as I thought the lens might melt.
Another issue is to make sure you have holes somewhere in the square tube for water to escape or modify the light mounts accordingly.
It's been a couple years now with no issues.
I probably went kinda nuts with this, but the boat is kept at the harbor and corrosion is an issue. For this latest boat, I have put considerable effort into little things to make them work better, and this is just one of them. I got tired of dicking around with lights every time I was going to trailer it somewhere. Now, I expect they will work every time.[/quote]
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