First of all, if you have the Big Tow Package then you already have one under your back bumper. Are you asking about a 7 pin to 4 pin adapter? If not, you can go to autozone and buy a universal 7 pin or 4 pin and then cut off the plug that's hanging under your bumper and wire in the universal one. Or... you can go to the stealership and buy the adapter that will adapt the plug hidden inside your bumper to the standard seven pin trailer configuration.
As was said, BIG Tow is wired. I use the 4 pin and have a plug adapter on mine to fit my trailer. I also have the harness to wire the 7 pin if I want. What are you looking for?
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The instructions are at the link below, but you need to have all the parts, except the brake controller harness that goes under the driver side dash. You only need the brake controller harness if you are going to wire up a trailer brake controller (e.g. Prodigy).
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