Hi All, to prevent "drowning" the trailer lights & wiring at every outing, whenever I get a "new" sailboat, I make a rudder pintle Mast crutch "cross" for it.
If the boat came with a crutch, then I attach an oak 1x3 board on it to hold the trailer lights at eye level by "bolts & wing nuts" that holds the tail lights
under the transom gunwale line to keep the lights protected from highway wind.

When launching the boat, I step the mast, remove the crutch-cross with all wiring & stow it into the tow vehicle before the boat/trailer enter the water.
This has preserved my "trailer lights" for years without any corrosion and bulb issues like when they were dunked underwater on the trailer frame.
It also allows emergency use to mount as temp trailer lighting for any other trailer without lights.

cheers all and HVD!
Mike
WWP15