Not offered according to my GMC dealer (for the I4) Terrain. You also can't find the option on the website when you build your own.
This is what you get on the Nox for the option:
Our Equinox Trailer Hitch Package mounts directly to your vehicle. No additional drilling required. 19169825 fits 2007-2009 Equinox Models and includes the Hitch Assembly, Ball Mount, Wiring Harness, and all necessary equipment (bolts, fuses and relays) for a complete installation. 19202502 fits 2010 Equinox Models and includes the Hitch Assembly, Wiring Harnesses, and Mounting Bolts. For 2010 Models, Trailering Fuses and Relays are factory installed and Ball Mount Assembly is sold separately.
Not positive but i don;t think you get a trans cooler since it is only a $250 option according to
www.chevy.com