2010 MACK CXU612 Suspension Problems

I AM A MECHANIC FOR ABF. FOR THE LAST THREE YEARS, MACK HAS SOLD TO ABF ROAD TRACTORS WITH DEFECTIVE 5TH WHEEL MOUNTING BOLTS. THE BOLTS STRETCH AND BECOME LOOSE WITH USE (USUALLY WITHIN THE FIRST 30,000 MILES). FOR UNKNOWN REASONS ABF HAS NEVER HELD MACK ACCOUNTABLE FOR THIS PROBLEM, PREFERRING TO TIGHTEN THE BOLTS WHEN A DRIVER COMPLAINS AND REPLACING BOLTS WHEN THEY PULL IN TWO. I HAVE REPEATEDLY WARNED MY SUPERVISORS THAT THESE BOLTS SHOULD BE REPLACED RATHER THAN REPEATEDLY RETORQUED, BUT HAVE BEEN REBUFFED DUE TO MANAGEMENT DISTRUST OF UNION EMPLOYEES. NOW OUR 2010 MODEL TRUCKS ARE GETTING 20-50K MILES ON THEM AND I AM SEEING NEARLY 100% WITH LOOSE 5TH WHEEL MOUNT BOLTS. WE PURCHASED REPLACEMENT BOLTS FROM MACK AND DISCOVERED THAT THEY WOULD NOT TAKE THE TORQUE SPEC THAT MACK GAVE US, THEY SIMPLY STRETCHED UNTIL THE CROSS SECTIONAL AREA WAS ABOUT HALF NORMAL AND...