2016 KEYSTONE MONTANA Wheels Problems

TRAILER IS LESS THAN A YEAR OLD. CAME ORIGINAL WITH TRAILER KING TIRES. DATE CODE 1015. ON JULY 21ST, 2017. I CHECKED TIRE PSI BEFORE LEAVING OVERNIGHT STAY. ALL TIRES WERE BETWEEN 78-80PSI. AFTER 49-50 MILES INTO TRIP ON I 75 NORTH BOUND. THE RR TIRE BLEW OUT. ROAD SPEED AT WHICH TIRE WAS RUN WAS BETWEEN 64-66 MPH. WE WERE AT 65 MPH WHEN BLOW-OUT OCCURRED. NO DEBRIS IN ROADWAY. CHANGED TIRE & DROVE TO NEAREST SERVICE FOR REPLACEMENT TIRE. AT THIS SERVICE I NOTICED RUST IN BELT PACKAGE. LIKE THIS TIRE WAS ASSEMBLED WITH RUSTED BELTS. ON RETURN TRIP HOME JULY 24TH. STOPPING AFTER 2 HOUR DRIVE AT REST AREA SOUTH OF OCALA,FL. I DID A WALK AROUND INSPECTION & NOTICED THE LF TIRE BELT SEPARATING. TIRE PSI WAS 78. NO DAMAGE TO TIRE. RELEASED AIR FROM TIRE TO AVOID INJURY & DROVE TO NEAREST SERVICE. HAD REMAINING...