I have a 2021 1500 sierra at4. Put a set of 3 led running lights on and tapped off the trailer running light wire. Well these new trucks are too smart. The truck can sense these lights and assumes a trailer is hooked up. From there, it thinks the other trailer lights are not working and warns you constantly. It also makes the side cameras come on when using the turn signals. I'm looking to see if hooking into the tail light parking lights might eliminate this issue.
After I posted, I realize my profile is a bit outdated. I had since had a 2018 high country 6.2 and now have the sierra AT4 6.2