Same issue on my truck 2022 ZR2. Same "No resolution GM is working on a fix" response from dealer. Started a claim with GM waiting for response. I NEED to tow regularly with this truck, tractor or travel trailer 6-8k lbs trailer multiple times a week. I think we can all agree this isn't safe. I just want the truck to work. I'd be happy if they found me another one, but this downtime is killing me. Before the problem was diagnosed, we spent a bunch of time testing on other trailers and other trucks. Can anyone tell me what the benefit of posting the issue to NHTSA? The dealer doesn't have anything to loan me and I just had to pay to have the travel trailer transported to my property. I'm losing faith here as the truck also makes a strange intermittent knock noise while warming up in the morning too. This situation with the trailer brakes is going to cause accidents plain and simple.