RECURRENT ISSUE AS I DRIVE AT SPEEDS RANGING FROM 35 MPH TO 75 MPH AND I HIT A PATCH,HOLE OR BUMP IN THE ROAD MY TRUCK WILL START VIBRATING VIOLENTLY,FEELS LIKE I AM ON A POKO STICK AND I CANNOT CONTROL THE STEERING.I TOOK ME ACCROSS 4 INTERSTATE LANES UNTIL I COULD STOP THE VIBRATION WHICH ONLY QUITS WHEN YOU COME TO A COMPLETE STOP.THE LATEST OCCURANCE TOOK ME INTO THE QUARDRAIL DAMAGING THE PASSENGER SIDE.I HAD THE TRUCK LOOKED AT BY THE CHRYSLER DEALERSHIP AND WAS TOLD NOTHIN WAS WRONG.THE LEFT TIEROR HAD AN OUTSTANDING RECALL BUT THEY SAID MINE WAS INSPECTED AND DID NOT NEED REPLACED.THIS HAS OCCURED BETWEEN 11 TO 15 TIMES SINCE I BOUGHT THE TRUCK LATE LAST YEAR AND I BELIEVE IT TO BE A SERIOUS ISSUE NEEDING INVESTIGATING.