TL* THE CONTACT OWNS A 2018 FORD F-350 SD. WHILE DRIVING APPROXIMATELY 60 MPH AND PULLING A 40 FOOT FIFTH WHEEL, THE VEHICLE DROVE OVER AN EXPANSION JOINT ON THE ROAD. THE FRONT END OF THE VEHICLE BEGAN OSCILLATING SEVERELY, BOUNCING ACROSS TWO LANES OF TRAFFIC. THE CONTACT MANAGED TO PULL OVER TO THE ROAD SHOULDER AND WAITED A COUPLE OF MINUTES BEFORE CONTINUING TO DRIVE. WHILE ATTEMPTING TO CONTROL THE VEHICLE, THE CONTACT SUSTAINED A TORN LEFT SHOULDER MUSCLE BECAUSE THE STEERING WHEEL SHOOK SO VIOLENTLY. MEDICAL ATTENTION WAS ONGOING AND SURGERY WAS REQUIRED. THE VEHICLE WAS TAKEN TO THE DEALER (BROADWAY FORD INC, 980 W BROADWAY STREET, IDAHO FALLS, ID 83402) WHERE IT WAS DIAGNOSED THAT THERE WAS STEERING OSCILLATION (PART OF TSB NUMBER: 18-2268). THE VEHICLE WAS REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE AND PROVIDED CASE NUMBER: CAS-15812304. THE APPROXIMATE FAILURE MILEAGE WAS 8,200. *TT *JB