Did you pay the extra $1,200 for the round wheels option?
I took it to the Ford dealer and the first thing they asked was if I had bought it there. Since I had only recently moved to that town, the answer was no. The lying piece of garbage then told me the wheels were fine and had the tires balanced. Now a balance would correct the problem for a thousand miles or so then it would recur.
I finally took it to the Firestone dealer in Hattiesburg MS and they said sure enough, three of the wheels were out of round tho one was just barely. I finally just bought two new ones which cured the problem.
Except for that problem it was a good truck.