2013 Lexus Rx 350

MY NEW 2013 LEXUS RX-350 MAKES A SIGNIFICANT AUDIBLE "CLUNKING" SOUND FROM THE REAR OF THE VEHICLE WHEN THE VEHICLE COMES TO A FIRM STOP AT EITHER LOW OR HIGH SPEEDS. THIS CLUNKING SOUND OCCURS WITH EVERY STOP FROM JUST A FEW MILES AN HOUR TO FASTER SPEEDS. LEXUS OF LAS VEGAS MAINTENANCE PERSONNEL HAVE LOOKED AT THE CAR AND CONFIRM THE "CLUNKING" SOUND IS FRAME/SUSPENSION RELATED AND IS NOT A LOOSE SPARE TIRE OR OTHER ISSUE. THEY INDICATE IT IS NOT A SAFETY ISSUE AND THERE IS NO FIX AS IT IS A PECULIARITY/DEFECT WITH ALL 2013 LEXUS RX-350 CARS. I PERSONALLY DROVE ANOTHER 2013 LEXUS RX-350 AT THE DEALERSHIP WHICH MAKE THE SAME CLUNKING SOUND FROM THE REAR OF THE VEHICLE. THE REPEATED "CLUNKING SOUND" IS IS DEFINITELY A VEHICLE DEFECT IN MY 2013 LEXUS RX-350. I AM NOT A SAFETY ENGINEER NOR WERE ANY OF THE LEXUS REPRESENTATIVES WHO LOOKED AT THE CAR AND THE "CLUNKING" SOUND ISSUE. I AM CONCERNED THAT THIS IS A SIGNIFICANT SAFETY ISSUE. FROM A MENTAL STATE OF MIND STANDPOINT, THE REPEATED "CLUNKING" SOUND WHEN STOPPING IS A MAJOR ATTENTION DISTRACTION AND REPRESENTS A SAFETY ISSUE FOR ME GIVEN IT'S INTENSITY AND CONSTANT REPEATABILITY. MY 2013 LEXUS RX-350 CAN BE MADE AVAILABLE FOR YOUR INSPECTION. REQUEST YOU RESEARCH THE ROOT CAUSE OF THE REPEATED "CLUNKING" SOUND IN THE 2013 LEXUS RX-350 SERIES OF VEHICLES, AND MY VEHICLE, AND DETERMINE IF IT IS A SAFETY ISSUE FOR ME AND OTHERS WHO OWN 2013 LEXUS RX-350 VEHICLES. *TR