I attached a picture that shows the corner crush tabs of your 2020 Cadillac CT6 that need to be removed for the hitch # C12160 to fit properly. view full answer...
The Curt hitch part # C12160 that you referenced is made from steel. Normally I would agree with your line of thinking about the galvanic corrosion but us and Curt have both found that it's not an issue on your vehicle so it's not something you'd have to worry about. view full answer...
Good question; yes, the sensor that opens the trunk on your 2019 Cadillac CT6 will still work after the installation of the Curt Trailer Hitch Receiver # C12160. As you can see by step 5 of the cut out of the linked installation instructions I added, you will unclip the motion sensor harness and then re-install it so the sensor will maintain its functionality. view full answer...
We have exactly what you are looking for.
For your 2017 Cadillac CT6 I recommend the Curt Trailer Hitch Receiver - Custom Fit - Class II - 1-1/4" # C12160 which has a tongue weight rating of 350lbs and a towing capacity of 3500lbs. You will want to check your vehicles owner's manual to find its towing capacity, and use the lower rating between the hitch and vehicle.
To tow a trailer you will need a vehicle wiring harness # C56323, Drawbar # C45521, and 1-7/8" hitch ball # 19256 or 2"... view full answer...