WHILE DRIVING WESTBOUND ON I-10 I WAS ATTEMPTING TO GET OFF THE NORTH BOUND OFF RAMP AND THE TRUCK BEGAN TO "WOBBLE" I HAD NO CONTROL OF THE STEERING WHEEL AND THIS NOT BEING THE FIRST TIME THIS HAS OCCURRED I KNEW NOT TO HIT THE BRAKES. THE TRUCK CONTINUED GOING WEST, I WENT THROUGH TWO MEDIANS AND HIT A SIGN BEFORE STOPPING IN A SOUTH BOUND ON COMING TRAFFIC LANE. THIS HAS HAPPENED THREE DOCUMENTED TIMES WITH TWO DIFFERENT FORD DEALERSHIPS AND THEY WERE ALSO GIVEN A LIST OF OTHER OCCURRENCES. I WAS TOLD THIS WAS CALLED THE 'DEATH WOBBLE" AND THAT IT WAS A COMMON ISSUE. EVERY TIME THE VEHICLE WAS TURNED IN FOR THE ISSUE I WAS TOLD THEY COULD NOT DUPLICATE THE ISSUE, THAT POSSIBLY GETTING NEW TIRES OR ALIGNMENT MAY HELP. NOTHING HELPED, I WAS JUST IN ON JULY 30TH FOR ROUTINE MAINTENANCE AND THE RECALL I LATER FOUND OUT ABOUT WAS NOT ADDRESSED. WHEN THE ISSUE WAS DISCUSSED WITH JONES FORD I WAS TOLD "LUCKY THING IS NO ONE HAS DIED FROM THIS"