I have followed the 4 pin back to where it ends as a 6 pin flat connector. There is an additional single wire outside that connector that is running inside the flexible split shield cover. I am assuming all 6 wires are still inside the cover possibly taped back. As for the trailer. Its a 20 ft. utility Sure Trac, we haul 2 Polaris razor 1000 xp side by sides. total weight around 4200#. The towing capacity is rated for 10000#. Vehicle weight is 43,000 # Combined gross is 53,000 # Thank you for the reply.Kelly