WHILE DRIVING 60 MPH ON THE FREEWAY (POSTED SPEED LIMIT 65MPH) PULLING A TRAILER LOADED WITH 3000LBS OF MATERIAL (TRAILER RATED FOR 7000LBS) THAT WAS SECURED WITH 5000LB TOW STRAP I DROVE OVER A ROUGH PATCH OF CONCRETE IN THE RIGHT LANE. TRUCK FELT LIKE IT WAS ALMOST JUMPING TO THE LEFT, STEERING WHEEL SHAKING VIOLENTLY, I COMPLETELY LOST CONTROL. THE TRUCK VEERED LEFT DRASTICALLY AND I CROSSED 3 LANES OF THE FREEWAY AND SLAMMED INTO THE MEDIAN WALL AT APPROXIMATELY 20 MPH. MORE THAN $15,000 IN DAMAGE TO THE VEHICLE. IT IS A MIRACLE NO ONE WAS INJURED. *TR