Hi Jake,
Years ago my Nacra 5.2 was on a very short trailer too.
The trailer lights were completely hidden.
I put an extra set of lights on a bar that strapped to the top of my N 5.2 sterns for that very same reason.
I got home from a regatta once and the left light was smashed.
I think I took out somebody's mirror.
I finally got a longer trailer.

I have the Murrays mast support on my current trailer.
I am planning to put a bracket on the support to hold trailer lights.
Since the support is bolted to and a part of the trailer, it should be legal.

Are you coming to Charleston?