TL*THE CONTACT OWNS A 2005 FOREST RIVER CARDINAL 36TS RV. WHILE DRIVING BETWEEN 55-60 MPH ON NORMAL ROAD CONDITIONS, SMOKE APPEARED FROM THE REAR OF THE VEHICLE. IMMEDIATELY, THE VEHICLE BEGAN PULLING TO THE LEFT WITHOUT ASSISTANCE. THE DRIVER PULLED THE VEHICLE OVER AND INSPECTED UNDERNEATH. HE OBSERVED THAT THE REAR DRIVER'S SIDE SHACKLE FAILED. A MINOR TEMPORARY REPAIR WAS PERFORMED AND THE VEHICLE WAS ABLE TO RESUME NORMAL OPERATION. THE VEHICLE WAS TAKEN TO AN AUTO BODY WELDER AND ANOTHER TEMPORARY REPAIR WAS PERFORMED. THE VEHICLE IS CURRENTLY BEING REPAIRED BY AN INDEPENDENT MECHANIC, WHO STATED THAT THE MAIN FRAME EXHIBITED A SEVERE CRACK. THE CONTACT HAS PICTURES OF THE FAILURE. THE FAILURE MILEAGE WAS 4,000 AND CURRENT MILEAGE WAS 6,000.