2013 FORD E-450 Wheels Problems

I AM A CONTRACTOR FOR FEDEX HOME DELIVERY AND OWN THE TRUCK IN REFERENCE. AFTER APPROX 4900 MILES, THE TRUCK FAILED SAFETY INSPECTION BY FEDEX AND NEEDED THE FRONT TIRES REPLACED. UPON INVESTIGATION, IT WAS FOUND THAT THE TIRES SUFFERED MAJOR/EXCESSIVE TREAD WEAR AFTER JUST ONE MONTH ON THE ROAD. WHEN I ADDRESSED UTILIMASTER, THE BODY COMPANY, ABOUT THE ISSUE I WAS TOLD IT WAS NOT THEIR RESPONSIBILITY AND TO CONTACT FORD. FORD EXPLAINED THE SAME AND TOLD ME TO CONTACT UTILIMASTER. NEITHER PARTY WANTS TO TAKE RESPONSIBILITY FOR DEFECTIVE TIRES THAT I HAVE NOW SPENT THOUSANDS OF DOLLARS REPLACING, TO DATE. THE WEIGHT AND DISTRIBUTION FOR THE TRUCK/CHASSIS IS IMPROPER ACCORDING TO A FORD ENGINEER. THIS IS DANGEROUS AND A RESOLUTION MUST BE FOUND BEFORE SOMEONE IS SERIOUSLY INJURED OR KILLED. THE TRUCK NEEDS TO BE PROPERLY REPAIRED OR TAKEN OFF THE ROAD. UTILIMASTER BELIEVES THE FIX IS TO...

THIS IS A CLASS "C" MOTORHOME MANUFACTURED BY JAYCO WITH OPTIONAL ALUMINUM WHEELS. (JAYCO GREYHAWK 31FK) ON THE BACKSIDE OF THE ALUMINUM RIMS IS STAMPED "DO NOT EXCEED 60 PSI". THE MOTORHOME COMES WITH LOAD RANGE "E" TIRES RATED AT A MAX. OF 80 PSI. THE JAYCO PLCARD ON THE DOOR JAM STATES THAT THE REAR TIRES MUST BE INFLATED TO 80 PSI. *TR