The Special Trailer Service tires are specifically designed for travel trailers, pop-up campers, boat trailers, and fifth-wheel trailers. These Hankook Vantra Trailer TH31 tires offer excellent durability and stability for towable trailers. These tires should not be used on cars or light trucks. The Hankook Vantra TH31 tires are made with an all-season compound using Hankook's Innovation Mixing System (IMS). This system helps to improve the durability of the tires by minimizing the disconnection of polymer chains and oxidation. The compound is molded into a symmetric pattern with an optimized tread footprint, ensuring even pressure distribution. This contributes to longer tread life and uniform wear, even under heavy loads. The Vantra TH31 tires also feature an asymmetric main zigzag groove. This design provides excellent traction, efficient water drainage, and effective stone ejection on different road conditions. Additionally, the slant design of the groove helps to prevent chunking and reduce tread damage. Internally, the Vantra TH31 tires are constructed with a strong steel casing and three reinforced steel belts. This robust construction adds to the overall durability and stability of the tires. The Vantra TH31 tires have a Service Description that confirms an N speed rating for each size. This means that for speeds up to the tire's maximum speed rating of 87 mph (140 km/h), the standard cold tire pressure recommended for the trailer and its load does not require any additional adjustment in pressure. Please note that special purpose trailer tires, like the Vantra TH31, are not rated by UTQG.