2008 HEARTLAND CYCLONE Suspension Problems

I HAVE AN 2008 HEARTLAND CYCLONE MODEL 4012 (41 FT LONG) 5TH WHEEL TOYHAULER RV TRAILER. IT CAME WITH 3 AXLES WITH 15" LOAD RANGE "D" TIRES ON IT. EVERYTIME I USE THE TRAILER I HAVE A BLOWOUT SCATTERING TIRE CARCASS AND TRAILER DEBRIS ALL OVER THE ROAD BEHIND ME. IT HAS COST ME TIME AND MONEY EACH TIME AND I AM AFRAID IS EVENTUALLY GOING TO LEAD TO A CATASTROPHIC ACCIDENT DUE TO LOSS OF CONTROL. AFTER CONTACTING [XXX] (SERVICE DEPT. AT HEARTLAND) CONCERNING IF A RECALL FOR HEAVIER TIRES AND AXLES HAD BEEN MADE, HE SAID A NEW "STICKER" HAD BEEN ISSUED TO ORIGINAL OWNERS DROPPING THE AXEL RATINGS DOWN. IT IS OBVIOUS THAT BY DOING THIS THEY RECOGNIZE THEY HAVE A PROBLEM BUT INSTEAD OF RECALLING THEIR VEHICLES AND RE-FITTING THEM WITH AXLES AND TIRES APPROPRIATE TO CARRY THE WEIGHT THESE UNITS ARE DESIGNED TO THEY SEND...

5TH WHEEL TRAILER GVWR STATED BY MFGR IS 18,000. THE 3 INDIVIDUAL AXLES ARE RATED AT 5200# EACH TOTALING 15,600# MAX.. TIRES ARE GOODYEAR MARATHON ST225/75R15 D-RATED MAX LOAD IS 2540 AT PSI 65 COLD TOTALING 15,240# MAX. UNIT HAS HAD TIRE SEPARATION AND BLOW OUTS. REMAINING TIRES ON UNIT WERE INSPECTED BY GOODYEAR WINGFOOT COMMERCIAL TIRES AND 4 OF 6 ON THE GROUND WERE SUSPECTED OF SUFFERING BELT BREAKDOWN/SEPARATION AFTER LESS THAN 6,000 MILES. INITIAL INCIDENT RESULTED IN DAMAGE TO RV TRAILER IN THE AMOUNT OF APPROXIMATELY $2,800. ADDITIONALLY, REPLACING FAILING/SUSPECT TIRES COST $636. AXLES PROVIDE 2,400# AND TIRES 2,760# UNDER THE MANUFACTURES STATED GVWR OF 18,000# . *TR