2004 Lexus Gx 470

WHEN I PURCHASED MY VEHICLE FROM THE LEXUS DEALER IT HAD AN OCCASIONAL THUMP, BUMP CLUNK WHEN I WAS STOPPED AT STOP LIGHTS. SORT LIKE SOMEONE WAS TRYING TO BUMP ME FORWARD. I HAVE COMPLAINED ABOUT THIS AT EVERY SERVICE APPOINTMENT INCLUDING WARRANTY APPOINTMENTS. NO ONE SEEMS TO KNOW WHAT IT IS. IT HAS GOTTEN MUCH WORSE. I THEREFORE HAVE TRIED TO DO SOME INTERNET RESEARCH AND APPEARS THAT NOT ONLY DOES LEXUS KNOW WHAT IT IS BUT THEY MIGHT HAVE ACTUALLY PUBLISHED A TECHNICAL SERVICE BULLETIN ON THE PROBLEM. I AM FEARFUL THAT THE VEHICLE IS BECOMING UNSAFE AND I BELIEVE WITH THE NUMBER OF COMPLAINTS I FOUND ON THE LEXUS SITES THAT THIS IS SHOULD BE A RECALL ISSUE NOT AN ISSUE THAT MY DEALER CONTINUALLY IGNORES. MY LEXUS ALSO IN COLD WEATHER (LOW 30S) HAS A LARGE GROWLING NOISE WHEN STOPPED AND BRAKES APPLIED. I THINK IT IS PART OF THE AFOREMENTIONED ISSUE. I HAVE HAD MY VEHICLE ALIGNED A FEW TIMES. IT HAS A SENSATION OF PULLING RIGHT. HOWEVER IT STAYS TRUE, PRETTY MUCH, ON THE ROAD. I SHOULD NOT HAVE THIS FEELING IN THE STEERING PLAY. LASTLY, I AM CONSTANTLY CHANGING OUT THE OUTSIDE LIGHTS ON THE VEHICLE. HEADLIGHTS, TURN INDICATORS AND REAR BRAKE LIGHTS.