The day I was buying the vehicle, I told the salesman about the vibration and his first response was the tires have a flat spot from sitting so long. I took it back the next day and told the salesman I wanted to cancel the transaction. He said we can fix the problem. They keep my truck a week, and said they put new tires on it. That did not help - it still vibrated. A mechanic rode with me, he said he feels a little and I said it was vibrating so much his pen rolled off his clip board, I mentioned that to him. So the salesman rode with me and then it was because it was a 4 cylinder, it caused the vibration, and then because it was a truck. He never would answer why it only does it at 50 mph and 60 mph. It does have a slight vibration at most speeds, and even worse at the speeds mentioned. I asked several times to cancel the deal and the salesman would not proceed with my request.