Just looked at my owners manual. It mentions damage to the transmission but nothing about the cooler. Since the engine isn't running while towing not sure how the transmission would get damaged unless you didn't take it off.
Use of a shield mounted in front
of the vehicle grille could restrict
airflow and cause damage to the
transmission. The repairs would
not be covered by the vehicle
warranty. If using a shield, only
use one that attaches to the
Picked up the Canyon Denali Duramax two weeks ago and it's great. Mileage is outstanding. In the process of installing the towbar/light setup. Demco baseplate, Roadmaster Sterling towbar and Air Force One brake system.
Went with Demco on the baseplates rather than other choices. Basically take off the tow hooks and replace with the Demco tabless brackets. Seemed to be the easiest of all to use. And the height at about 15", according to others, aligns nearly perfectly with the hitch receiver on the DS. The BlueOx bar is up higher in the area of the cooling opening.
Gary 2021 NH Majestic on order
Ram 5500 with Bodywerx bed
Box Elder, SD and the road