West8

New truck (2024) and new trailer (2023) with the same issue as described by Wxman post from April 1, 2021. I towed this trailer with my old 2006 Silverado 3 times without any issues. This past weekend was the first tow with my new truck. Drove 1.5 hours each way and got 50 to 60 "Check Trailer Wiring" DIC messages, each way with intermittent trailer break loss. I called a mobile RV repair service who determined that the issue is not with the trailer or connection. I'm taking the truck into GMC service next week. I will post updates as available.