2009 KEYSTONE PASSPORT Tires Problems

PURCHASED KEYSTONE PASSPORT TRAVEL TRAILER WITH MISSION TIRES ST205 75R 14. DOT 7DJTY0T1108. EARLY ON 2 TIRES LOST AIR, NO PUNCTURES OR CAUSE. LATER A THIRD FLAT WAS DUE TO PUNCTURE. JULY OF 2014 NOTICED EXPOSED BELTS AND UNUSUAL WEAR ON ANOTHER TIRE. A LOCAL TIRE DEALER INFORMED ME THE TIRE WAS COMING APART AND WE'RE FORTUNATE THAT IT DIDN'T BLOW OUT CAUSING DAMAGE. DECIDED I SHOULD GET NEW TIRES OF ANOTHER BRAND. DEALER INSPECTION OF THE MISSION TIRES REVEALED TWO OTHER TIRES WITH BELT SEPARATION AND ONE WITH TREAD SEPARATION. HE SAID TIRES LOOKED BAD, DANGEROUS AND DEFECTIVE. HE SAID WITH AS FEW MILES ON THEM, +/- 10,000, THEY SHOULDN'T BE IN THAT CONDITION. CONTACTED TIRECO, THE MFR. OF MISSION TIRES. ACCORDING TO LISA, TIRES MFRD. NOV. OF 08 AND OUT OF WARRANTY. WARRANTY STARTS DATE OF MFR. TIRES CLOSE TO 2 YRS. OLD WHEN I PURCHASED THE TRAILER...