Free: Contests & Raffles.
This is the bracket my EZ Loader trailer uses for lights. Looks like yours did too. The J-bolt is what holds the bracket to the trailer. The 'J' hooks to the bolt in the trailer beam. It isn't great in my opinion, but it's functional.
I have carpeted side bunks on my boat trailer. I launch in rivers and tidal affected areas and it makes life much easier. I also mount my lights off the bunks so they dont get hooked on as much stuff nor go in the water as often. I also took some metal grating and welded it to the trailer so that when launching or retrieving in difficult situations i can walk 1/3 way down the center of the trailer to retrieve or launch the boat. gator glide might reduce the need for that but now would be the time to do that project.