2020 GMC Sierra 2500 Structure

While towing my dump trailer early in the morning for about 20 minutes I noticed sudden hard up shifting and down shifting in some gears on flat surface roads. I then proceeded to approach an incline hill about a 5% grade and then, what I've recently learned, my transmission locked up and released for a split second. The roads were slick so it didn't seem too harsh, I continued with no incident for another 40 miles and then it happened again while pulling up a 7% grade in a left hand sharp turn at 40 mph. The truck fish tailed and jack knifed my trailer on the left rear side of my truck and the front left side of the trailer. I was on a one lane road and had to continue until I reached my detitanation, I slowed and maintained a speed of 45 in order to prevent it from happening again but it did it 5 more times before reaching my destination. I'm currently scheduled to have the transmission checked on 02/27/2025 at Peterson's Chevrolet Nampa Idaho. In the meantime, I have no means of using any of my trailers.

The contact owns a 2020 GMC Sierra 2500. The contact stated that when the vehicle was parked, the contact's husband noticed that rainwater had entered the rear interior of the vehicle. The contact stated that the rainwater had entered through the rear sliding window. In addition, the contact stated that the aluminum casing around the rear window had fractured. The contact stated that due to the failure, the interior of the vehicle had a moldy odor. The vehicle was taken to the dealer where it was diagnosed with a fractured window frame. The contact was informed that the rear window and frame needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure. The contact was informed that the repair would not be covered under warranty. The failure mileage was approximately 69,000.