1973 JEEP WAGONEER Tirestreadbelt Problems

WHILE DRIVING APPROXIMATELY 70 MPH ON INTERSTATE HIGHWAY TIRE PRESSURE ON ALL 4 TIRES HAD BEEN CHECKED EVENING BEFORE, AT 34-35 PSI ALL TIRES.*AK TIRE JUST "CAME APART" (NO BLOWOUT, NO FLAT) -- APPEARS AS IF ENTIRE SIDEWALL SEPARATED FROM INTERNAL BELTS (TREAD WAS STILL INTACT, INSIDE SIDEWALL GONE) APPARENTLY PIECES STARTED FLYING OFF ABOUT A MILE BEFORE THIS, BUT WAS UNABLE TO IDENTIFY THE NOISE, UNTIL THE TIRE CAME APART AND LOST ALL PRESSURE. WAGONEER IS PRETTY STABLE, SO LED ONLY TO A (VERY) ABRUPT PULLOVER ONTO SHOULDER OF HIGHWAY. (ALSO HELPED THAT IT WAS A REAR TIRE) WANTED TO REPORT IT -- HAVE TWO MORE TIRES OF SAME TYPE ON VEHICLE, ONE OF WHICH APPEARS TO HAVE SERIOUS CRACKS IN SIDEWALL.