I was driving my Ford F-250 SuperDuty at 65 mpg on a 4 lane hwy (posted speed 65) when the truck suddenly, without warning, shaking and bouncing violently. The jostling was so violent my head hit the top of the cab and my glasses were bouncing on my face. The steering wheel was shaking but I was able to get to the side of the road and stop. It was the worst, most violent shaking I have ever experienced. I thought my wheels were coming off. My head, neck, and back are sore today from the incident. The truck gave no warning, no warning lights, sounds, etc. to indicate what was about to happen. It shook so hard my vision was doubled. *I do NOT know what failed or malfunctioned. It appeared to be wheels, steering, suspension? *This put me at grave risk of losing control, overturning, rolling and getting killed. It put others on the highway at risk because I could have caused them to wreck by the actions of my uncontrollable truck. I could have killed myself and others on the highway. *I have not had the opportunity to take this back to a dealer yet. *No one has inspected it yet. *No warning lights, no sounds, no indication of impending problem. Ford should NOT allow this to happen on ANY vehicle. This is a death trap and I am afraid to continue driving it. DEATH TRAP!