I have a '90 Silverado 3500, and I might have to tow a load tomorrow. Problem is I don't see a connector for a trailer. I got underneath and looked, but couldn't find anything. The trailer I might use has a 6 pin connector. In the past I had tap it lights, but those have been long gone. Anyway, what would I need to wire up a 6 pin connector on my truck to mate with the trailer?