I have a 2021 GMC AT4 Diesel pickup. I was pulling a trailer with my side by side on it when the rear brakes locked up and skidded for a split second. This happened a total of 3 times before we got to our destination. This happened again on our way back home. We crippled it back to the house at approx 40 miles per hour. The trailer weight was well within the limits of weight, so that was not an issue. We also disconnected the trailer brakes thinking this was the problem but it still locked up. Has anybody had an issue with this? GMC said they could not find anything wrong. There is definitely something wrong! This is very dangerous!
