My truck has experienced the "Death Wobble" at least a dozen times. The dealer will not fix the problem even though there is a technical service bulletin# 22-005-06.
I had the problem fixed by a non dealer mechanic but it will cost $3000 to have the front steering and axle rebuilt.
Parts inclued: 2009 Steering Upgrade Kit $400 plus labor, Ball Joints $600 plus labor, Steering Stabilizer $200 plus labor, new needle bearing in the steering box $200 plus labor, and a 4 wheel steering alignment $100. Also, make sure you have good E rated tires with the correct air pressure for the tire size. The problem is more common on 4x4 trucks with a diesel engine due to the weight of the engine.