With the help of GM customer care, they made a phone call to the dealer who originally told me the truck was fine and they all vibrate, and now the dealer replaced the terrible Goodyear assurance tires with a set of Bridgestones and the wobble is gone and the harshness of the ride has diminished quite a bit. Overall I think that is the best it is going to get and I am happy with it. So there must have been at least one tire out of round.