2006 FORD F250 SD User Comment / Complaint

I have a 2006 f250 that the front end shakes violently after hitting a hole or small bump in the road at 55 to 60 mph,then you must use both hands to control vehicle and slow down to under 40 mph or less to regain control. this is an accident waiting to happen. i am a large man 6'2" 240lbs and my fear is that my wife or someone of a smaller stature be driving when this happens and results in a fatality. this has happened several times throughout a six month period i owned the truck and is continually getting worse , by that i mean every day this past week.