State vehicle inspection, tire specific

This thread reminded me of my recent troubles with my car trailer. Wanted tires with certificates, only tires that fit the bill at Discount were radial trailer tires. Trailer is rated at 7500 pounds. Had 8000 pounds of pellets on it. Stopped to get a bite to eat. When I went to leave the exit that I lined myself up with was blocked. Had to go around the back. Curb was protruding out a ways. Backed up 6 times trying to minimize the hit. Was a glancing shot, at about 3 mph. Few weeks later I had 6k pounds of pellets on it. Two pallets were as centered over the axle as possible. Third one was more towards the tail. Had my equalizer hitch. Coming home, 50 mph and had a blowout. Course the spare was at home...Fast forward a few months. Cruising down 231 at 60mph and the trailer started shaking violently. Other tire on that side went out. Tore up the wiring on that side, mangled the fender some as well. Keep in mind that prior to me hitting the road with the trailer I always check tire pressures.
Sorry for the hi-jack. While the "p" series tires may satisfy state inspection I would peel them off. You are a few curb shots, sharp pot holes away from a potential disaster...