Well its time to give up the quest. After constant pulling to right, crazy vibration on the freeway, brakes and continued excessive road feel on the freeway. Driving on the freeway makes the steering move with every tiny bump. Its just not how a modern truck should drive. Had a case number with GM Sr Advisor and was at the dealer for 3 days. That didn't help. Picked it up today and the dealer told me "It drives like GM HDs are supposed to". Nothing I can do but accept GM can't make a decent driving HD truck. I feel like I was conned into the sale. Should have tested the truck greater at higher speeds but I never would have thought. I do like the way the truck looks and the features but.... Anyway be careful before you buy an HD GM. I think they have a lot to figure out on a quality truck. Going to look at Titan XDs and Fords new F150 with Max Payload or Fords Super Duty. RAM has a lot of AC issues that won't work for me.