Chad Weber

I'm trying to add reverse lights and a turn signal light bar to the back of my truck. The original plan was to tap into the existing wiring for the trailer plug. While trying to get to it I noticed this unused, 6 prong output and was wondering if it had the wiring I need and what the harness was that plugs into it. I've been Googling about it for 2 hours now and as far as the internet is concerned it doesn't exist. Someone please help. Can I use this? And if so what it the plug called so I can buy a harness