installing 4 post trailer plug on grizzly

I attend an event next month where we drive around the campgrounds and drink beer all day/night, and as per usual I am going to take my wheeler and pull my 1 place trailer to haul people around. I think I’ve got my radio ready to go, but I was thinking it would be cool to be able to hook the trailer lights up to the bike so they would be illuminated in the dark.

Previous owner installed a 2 prong plug that he said he used for an electric pump on a small sprayer, but I haven’t looked into what that is tied into.

Just wondering what kind of splicing I’m going to have to do, or where I need to splice into? Not worried about my abilities, just that I don’t have the knowledge of grizzly wiring to tear into it. I honestly dont care if I have brake lights or anything, mainly that the marker lights / tail lights are illuminated. Any examples, tips, tricks will be appreciated.