Had to drive to a town about 40 miles from here finally in the new truck. Now, the most i have gotten her up to until then was around 60mph. I have noticed a slight vibration at that speed, but just figured it was the 22" rims, and low profile tires. Meh, not the case. Something is seriously F d up on the front end. Once I got it up to above 65, it felt like the front end was going to shoot out from under me, and I was going to loose all control. It literally beat the shiot out of me. Backed off the throttle a bit to smooth her out. Now this may be as simple as a rotate and balance. I have never though, had a vehical ride so rough on the interstate. Very interested in what your thoughts are on this issue. from 0-55mph, you would barley notice anything.