Add another affected truck to this list. Two days ago I finally discovered some water on the back seat of my 19 RST. Sure enough, I stood there and poured a bottle of water over the back of the truck and watched as the water poured in. I just stood there in disbelief. I walked around to the other side and did the same thing as water dripped on the inside. Immediately wondered how long it’s been this way and just how much water has gotten inside of the truck since I’ve owned it (Purchased Jan. 11th). Started researching and found this thread on the issue and read what some of y’all have already dealt with made me furious. I took my truck to the dealer I bought it from when they were finally able to see me the service guy walked up and said “back glass leaking water?” Unreal. I have a case opened up with GM and said they won’t be able to look at it until Monday. I could type a page explaining how I fought to get an acceptable loaner, but long story short for anyone else reading this DO NOT SETTLE FOR ANYTHING LESS THAN WHAT YOUR TRUCK IS CAPABLE OF. I was finally able to get 4dr 4wd RST just like mine that I NEED for work.