2006 STERLING LT Suspensionrear Problems

I AM WRITING TO INFORM YOU THAT THERE IS A SAFETY PROBLEM WITH THE HENDRICKSON HAULMAX SUSPENSION USED ON MEDIUM AND HEAVY DUTY TRUCKS. IN MY CASE THE BOLSTER SPRINGS BEGAN TO LEAN TO ONE SIDE OF MY TRUCK, AND THE BOLTS ON THE WHOLE SUSPENSION WOULD NEVER STAY TIGHT. WHEN THE VEHICLE WAS TAKEN TO THE GARAGE TO BE FIXED IT WAS NOTICED THAT THE WALKING BEAMS ON THE TRUCK WERE IN AN UNSAFE CONDITION AND THE WHOLE SUSPENSION NEED TO BE REPLACED. THE COMPANY I LEASE ON TO HAS FOUR TRUCKS WITH THIS SUSPENSION AND THEY ARE ALL DOING THE SAME THING, IN FACT ONE OF THEM THE SUSPENSION TOTALLY COLLAPSED ON 9/6/07 AND IS NOW IN THE SHOP GETTING REPAIRED. I WAS ALSO INFORMED BY A FELLOW DRIVER THAT THE COMPANY HE HAULS FOR HAS SOME TRUCKS WITH THIS SUSPENSION AND TWO OF THEM THE WALKING BEAMS...