I HAVE A FORD F350 HEAVY DUTY 1 TON, I HAD EXPERIENCED ON SEPARATE OCCASIONS WHEN TRAVELING WITH SPEED AROUND 50-65 MPH, IF A BUMP (SLIGHT) DIP OR ANY SLIGHT VARIANCE IN ROAD MY TRUCK WILL BEGIN A VIOLENT SHAKE. I HAD RECEIVED THE RECALL NOTICE OF IMPROPER AIR PRESSURE AND CAUSE AND EFFECT. I HAVE HAD MY TIRE PRESSURE CHECKED ON NUMEROUS OCCASIONS, I HAVE ALSO HAD TAKEN MY TRUCK TO LOCAL DEALERSHIP TO CHECK FRONT SUSPENSION , NOTHING FOUND TO BE WRONG WITH FRONT END. (SUSPENSION). ON SEPT. 12, 09 I WAS TRAVELING ON HWY 199 COMING FROM MADILL, OK (JOB) COMING TOWARDS DURANT HAVING EMPLOYEE IN TRUCK (FRONT PASSENGER SEAT) MY TRUCK BEGAN TO VIOLENTLY SHAKE, THROWING MY TRUCK INTO A CONCRETE BRIDGE. I STEERED TRUCK THE BEST I COULD CONSIDERING THE TRUCK WAS UNCONTROLLABLE. THE REAR END OF THE TRUCK CLIMBED OVER THE BRIDGE THROWING THE TRUCK NEARLY ON ITS SIDE LANDING IN ONCOMING TRAFFIC FACING OPPOSITE DIRECTION OF TRAVEL 60FT. AWAY FROM BRIDGE. MY TRUCK APPEARS TO BE TOTALED. I OWE MORE THAN THE VALUE OF THE TRUCK AND NOW. MY EMPLOYEE AND MYSELF WERE TREATED TO LOCAL HOSPITAL I NOW HAVE A HERNIA FROM THE IMPACT OF THE TRUCK INTO THE BRIDGE.. DUE TO SUSPENSION. I HAD TOLD OFFICER THAT THE TRUCK HAD DONE THIS BEFORE I HAVE RECEIVED A TICKET FOR NOT MAINTAINING SAFE VEHICLE. MY INSURANCE DOES NOT COVER MY PERSONAL INJURIES. I FEEL LIKE FORD HAS NOT OWN UP TO DEFECT OF THE TRUCK SUSPENSION. MAYBE DOT SHOULD INVESTIGATE FORD AGAIN. *TR