2001 INTERNATIONAL HARVESTER 4700 Structure Problems

I OWN A 2001 INTERNATIONAL FLAT BED TOW TRUCK,ALSO REFERRED TO AS A ROLL BACK OR CAR CARRIER.I HAVE HAD ONE INCIDENT WITH THE THE"L"ARM BRACKET THAT RETAINS THE "L"ARM FOR THE WHEEL LIFT COMING OFF MY TRUCK AND ANOTHER INCIDENT WHERE THE COMPLETE HYDRAULIC CONTROL PANEL ASSEMBLY THAT GOES FROM ONE SIDE OF THE TRUCK TO THE OPPOSITE SIDE, FALLING DOWN.THE EQUIPMENT WAS INSTALLED BY CHEVRON CARRIERS AND WRECKERS,LOCATED AT 7320 W.MARKET ST,MERCER,PA,16137.THEIR PHONE NUMBER IS 724-981-7500 OR 800-886-6400.I CONTACTED CHEVRON AND NOTIFIED THEM OF THE PROBLEM WITH THE HYDRAULIC CONTROL PANEL AND ASKED FOR REIMBURSEMENT FOR THE REPAIR TO WHICH I WAS REFUSED.I DEEM THESE TO BE SAFETY ISSUES.BOTH PROBLEMS WERE CAUSED BY THE LACK OF LOCK WASHERS OR SPACER WASHERS BEING INSTALLED UNDER THE HEADS OF THE BOLTS CAUSING THE BOLTS TO LOOSEN UP ON THE " L" ARM AND THE BOLTS THAT HOLD THE HYDRAULIC PANEL...