2012 LEXUS CT Suspension Problems

I PURCHASED MY TWO NEW 2012 LEXUS CT200HS IN DECEMBER 2012 WITH 23 MILES ON IT. ONE OF THEM HAS BEEN TOTALLY FINE. THE OTHER ONE, FROM THE FIRST DAY, HAD A VERY JITTERY RIDE. I RETURNED TO THE DEALER AND THEY CONFIRMED THE RIDE WAS ABNORMAL AND THEY REPLACED ALL 4 MICHELIN TIRES. THE TIRE REPLACEMENT DID NOT CHANGE THE CARS RIDE OR BEHAVIOR. I'VE RETURNED TO 2 LEXUS DEALERSHIPS MULTIPLE TIMES AS WELL AS HAVE BEEN WORKING WITH LEXUS HQ, AND THEY'RE ALL NOW SAYING THAT THE CAR IS PERFORMING AS DESIGNED. I CAN DEAL WITH A ROUGH RIDING CAR, BUT AT HIGHWAY SPEEDS, THIS LEXUS HAS A HIGH FREQUENCY VIBRATION THAT TRAVELS THROUGH THE CAR: CAN FEEL IN THE FLOOR, STEERING WHEEL, DOORS, SEATS. I COMMUTE 17 MILES TO WORK AND BY THE TIME I EXIT THE HIGHWAY, MY FEET AND LOWER LEGS ARE NEARLY NUMB FROM...

TL* THE CONTACT OWNS A 2012 LEXUS CT 200H. THE CONTACT STATED THAT WHILE DRIVING 2 MPH, THE VEHICLE TRAVELED OVER A CURB AND THE KNUCKLE OF THE LOWER CONTROL ARM BECAME FRACTURED. THE CONTACT STATED THAT THE METAL DID NOT APPEAR TO BE HEAT TREATED PROPERLY. THE VEHICLE WAS TAKEN TO A DEALER FOR DIAGNOSIS AND HE WAS STILL AWAITING A FINAL DECISION ON WHETHER IT WAS A DEFECT OR NOT. THE MANUFACTURER WAS NOTIFIED AND STATED THAT THEY WOULD FURTHER INVESTIGATE. THE FAILURE AND CURRENT MILEAGE WAS 3,942.