Finally got to tow our travel trailer with my 2022 Tahoe High Country duramax diesel. Once on the road, I realized I did not have a trailer brake. I remember when I bought the Tahoe, the dealership said that the trailering package had constraints. I guess the trailer brake was one of the constraints. I am wanting to have a trailer brake installed. Is that a big issue? I don’t want the install to change the look of the design and possibly affect or interfere with functionality on the other vehicle components.
You ought to speak with the dealership. Now I do remember pickup guys with your generation adding the trailer brake controller to their pickups and it being plug and play, the wiring was behind the dash already. This was for factory integrated trailer brake controller.
You also may have wiring under your dash in a taped up bundle for an aftermarket trailer brake controller.
On the older generation GMT900s, the Integrated Trailer Brake Controller cannot be added without literally taking apart the truck to add it. We all have the bundle of wires taped up for an aftermarket one as well under the dash.
If you are wanting an aftermarket one, consult your owner's manual.