Trailer hitch wiring
 

OK, just installed an aftermarket hitch! Beautiful fit, tucks high under the bumper (not like the handi-cap access ramp hitch I had on my pathfinder, I used to be able to rake the lawn with it, it was so low)
Now for the fun part.
My H3 doesn't have the trailer package. Now one would think that Hummer would run a set of wires, in case some-one decided that they wanted that option down the road. (So the GM tecks would have an easy time of it.)
I have the short six pin set up,that came with the hitch, and I know that you can always adapt down to four if need be.
My question is, "Where the frick, are the wires/harness at the back of the vehicle to plug into? Do they exist, or do I have to go to Hummer just to have (what I'm sure will be a very expensive ) set of wires run from front to back?
Please don't guess, but if anyone knows for sure it would be greatly appreciated.
I love the commradery here and If I can ever help anyone I am more than willing.

Van Can.