The AWD comes prepped for the tow package in that I believe it already has the better cooler, 2 fan controllers and the wiring prepped in the back. All that's missing is the hitch itself and the final wiring for the trailer lights.
There are several threads here on how to install the hitch and wiring in your AWD.
I would go with an aftermarket hitch (I used Curt) as the OEM one requires trimming the bumper. The class II Curt I installed bolted on easily and wired up with a harness I also bought from Curt.
If you go with aftermarket, the receiver will be below the bumper. A drawbar with a 4" rise (5" drop) will work perfectly to get you to a standard 18" hitch height once installed.