Hey Tim;
Looking through the old Trapeze magazines, my favorite parts were where FD owners would show their upgrades… mine isn’t a speed increaser, but safety.
I’ll be the first to admit it… I hate trailering at night. The lights are weak, they flash like they’re anemic, and I end up putting reflectors all over the place to make the boat more visible.  Goofing around on ebay looking for trailer lights, I stumbled across a number of products that allow the lights to run directly from the battery in parallel instead of in series.  I bought one for a screaming deal ($12) and installed it on my Volvo.