2006 FORD F250 SD User Comment / Complaint

Vehicle shakes uncontrollably after hitting a bump in the road at highway speeds of 60 to 75 mph. vehicle must be brought to a complete stop to regain control, then rides smoothly. vehicle was taken to the dealership to fix the problem, dealer stated that the problem did not occur during a road test of 22 miles. the service advisor states that nothing is wrong with the vehicle. this is the fourth time this problem has happened in 35000 miles. dealer refused to test drive in a specific area were the problem has occurred multiple times. the truck is unsafe for interstate driving.