Joined the Mission Tire Club (MTC) today. Heading east on I-40 just outside of Hickory, NC when the rear passager side tire blew. Didn't know, but a car was flashing lights and then saw tire tread. Luckily, no trailer damage upon initially inspection (sitting on highway). Whole sidewall was blown out on outer side. Tires were only 1 year old and check pressures prior to every trip.