I WAS DRIVING ON A PAVED HIGHWAY AT ABOUT 50 MPH WHEN I FELT A SLIGHT WOBBLLING SENSATION THAT FELT LIKE IT WAS COMING FROM THE REAR OF THE VEHICLE. I LET OFF THE ACCELERATOR AND APPLIED MY BRAKES AND THE VEHICLE SUDDENLY VEERED SHARPLY INTO THE ONCOMING LANE OF TRAFFIC. I TURNED THE STEERING WHEEL TO GET THE VEHICLE BACK IN MY OWN LANE AND THE VEHICLE VEERED SHARPLY BACK TOWARD MY LANE AND STARTED TO GO OFF THE ROAD. THEN THE VEHICLE STARTED VEERING SHARPLY BACK AND FORTH BETWEEN BOTH LANES AND I HAD NO CONTROL WITH THE STEERING WHEEL. I HAD LET OFF THE ACCELERATOR WHEN IT STARTED VEERING ALL OVER THE ROAD. AT ONE POINT THE VEHICLE WAS TURNING SIDEWAYS AND I THOUGHT IT WAS GOING TO ROLL OVER. I WAS APPROACHING A SHARP CURVE AND THE VEHICLE WAS HEADED TOWARDS A POWER POLE AND 3 CONCRETE IRRIGATION BOXES. I KEPT TAPPING THE BRAKES UNTIL THE VEHICLE STOPPED, RUNNING OFF THE ROAD NEAR THE POWER POLE, BUT FORTUNATELY DID NOT MAKE IMPACT WITH THE POWER POLE OR THE CONCRETE IRRIGATION BOXES. WHEN I GOT OUT TO SEE WHAT HAPPENED, THE REAR DRIVER'S SIDE TRAILING ARM WAS HANGING DOWN AND WAS NO LONGER ATTACHED TO THE VEHICLE. WEATHER CONDITIONS WERE SUNNY, ABOUT 80 DEGREES AND THE PAVEMENT WAS DRY. NO POLICE REPORT WAS FILED SINCE I DID NOT HIT ANYTHING. I HAD JUST MET ANOTHER ONCOMING VEHICLE APPROXIMATELY 10 SECONDS PRIOR TO THIS; HAD THE TIMING BEEN DIFFERENTLY I WOULD HAVE HIT THEM HEAD-ON WITH NO WAY TO STEER THE VEHICLE TO AVOID THE COLLISION. VEHICLE WAS THEN DRIVEN