So, I just got a hitch, but it occured to me that I need trailer wiring. A search reveals tons of people saying that borked up trailer wiring is responsible for all manner of ills. But nobody says how to do it. What, then, is the *right* way to hook up trailer wiring? Where do I splice? What plug? What mounting location? Etc, etc. There should be a tech article about this, but there isn't. My hitch (uhaul-branded DrawTite as far as I can tell) does not appear to have a wiring mounting location.