Dumb question, what has most used to power them up? The vehicle battery?

I ran a switch in the truck when I did it. I had a quick disconnect at the same location where my trailer connection for lights/brakes is. That way I could turn them on from inside the cab. Makes for loading the trailer great at night, especially if your launch doesn't have great lighting. You can see them under water really well.

All three sets I've done were powered by the parking lights on the trailer. I saw no reason to have a separate circuit. Two sets were amber therefore they are less likely to be an issue with law enforcement. One set was white. While not legal under the letter of the law, they weren't an extravagant color that drew the attention of law enforcement either.

All three sets are on anytime the running lights are on while running down the road.

Buck

Bakc when I had the Mistress!!

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That trailer upgrade looks great. The trailer that I had on the boat was a prestige and it wasn't very good. It was designed for a Formula, and it was just never right. It came with the boat, and I never really traveled alot with the boat. It did its job, but your new trailer looks GREAT

Here is a good link, most wire directly to the parking lights and then have a waterproof switch on the tongue of the trailer.

http://www.wakeworld.com/forum/showthread.php?t=794995

Thanks for the input. I think I may have something to add to the to-do list. That link had some good ideas in it.

The trailer looks great. I am liking the new trend of metal bunks with a wood and/or plastic cap on them.

However, if it were me; I would add some front V-bunks to that trailer.
Why?
1) The winch/bow stand up front too much of a focus point to hold all that weight forward of the V-bunks.
2) The V-bunks are going to help you hit the the trailer centered and into the winch stand when loading in a breeze and/or current.
3) I see that you have some PVC guides, but they are really only there to keep you from hitting the trailer cross members when loading.
4) That trailer is going to flex, and you will want a lot more hull support when it does flex vs. having it bounce up and down on the winch stand alone.
5) V-bunks in the front 1/2 half of the trailer will help you load. V-bunks on the back half will make sure it centers as you come up the ramp.

If you have difficulty loading it with the current way it's setup, the V-bunks will help.