I have a 2015 Chevy Silverado 2500 HD with the 6.0L i bought a few month ago and noticed this same issue. I had the dealer look at it and they said that wone of the ball joints had some play and they adjusted the nut on the gear box. Im still having the issue hitting bumps or coming to a quick stop at a high speed. They told me they would try replacing the "center link" to see if that fixes it.
Before i bought this truck i was looking at a 2016 3500hd with the 6.0L and it had the same issue. Starting to get frustrated.
