I have a two week old Hummer H3. I took it in to the dealer this past Monday because I noticed that when I'm driving at 45mph the steering wheel shakes like the front wheels are out of round. The dealer changed out the wheels, checked the front end and did everything possible. Unable to find the reason for the problem they drove a brand new Hummer H3 off the lot, had the same problem with the shaking at 45mph and stated that the shaking at 45 was standard because of the 4 wheel drive. I'm no mechanic but this sounds a bit strange, can anyone provide some insight? My Hummer H3 is a 2007.