Blazer makes an LED trailer light kit with a 5 wire flat connector. It includes the wiring and connector. I put it on my 18' boat. The only problem I had was that my boat is very wide, and the wire for the backup wouldn't reach down the trailer and across to the drivers side. I called them and they sent me a new longer harness. Works good, but backup camera on my truck not so much for backing up trailer. The 5wire flat requires an adapter and uses the big round trailer light connector that most recent trucks have. If you get the adapter, get one that adapts to both 4 and 5 wire.