OPEN COUNTRY R/T Tires (350170) by Toyo®. 35X12.50R18, Speed Index 99 mph, Max Load 3417 lbs, Tire Weight 74 lbs. Season: All Season. Type: Truck / SUV, All Terrain / Off Road / Mud. Off-road performance meets on-road comfort with the all-new Open Country R/T. Built rugged for any terrain, this tire offers excellent off-road traction, durable construction and aggressive styling. Its ability to tackle dirt, sand and rocks is inspired by the legendary Open Country M/T, while its quieter ride is a nod to our best-selling Open Country A/T II. These tires are 100% American-made at the state-of-the-art Toyo Tires factory in Georgia.