OK - heres a weird idea I got from my boat. I am going to rig up a jack on my sportsman thats hidden tightly away (when not in use) but so you can plug your trailer lights into so when ever you brake or turn signal in the truck, the appropriate lights come on the quad.

could be a kinda backup/additinal turn/brake system when hauling at night

My boat had signals/brake lights hooked up to the trailer - it was pretty cool

 

that would be kinda of a weird set up. but it would a first for sure lol. sounds like it would be alot of wiring but would look kinda of cool i guess. let us know how it works out for ya.