Toyo Open Country R/T Trail Tire 37x13.50Rx18 124Q D/8The Open Country R T Trail rugged terrain tire delivers better off road grip than a traditional all terrain tire, most evident in the sand, mud, and deep snow. The extra thick shoulder and sidewall lugs dig into deep and soft terrain. This thickness also provides impact and puncture resistance. With the off road chops to perform in varying terrain, the Open Country R T Trail is designed for light truck and SUV owners who want more off road capability