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Power King Towmax Vanguard 185/80-13 D 99/95N Trailer Service Tire Special Trailer Service tires are developed specifically for use on travel trailers pop-up campers boat trailers and fifth wheel trailers. Power King Towmax Vanguard tires are designed to deliver dependable robust service for towable trailers. Special purpose trailer tires are not intended to be used on cars or light trucks. The Towmax Vanguard utilizes next-generation Towmax technology and an optimized 8/32stread depth to balance heat build-up while providing stable towing characteristics in inclement weather. The Towmax Vanguard’s symmetric tread pattern features wide shoulders for improved stability and employs decoupling grooves molded into the outboard elements to reduce irregular wear under heavy loads. A robust Scuff Protector is built into the sidewall to help reduce the propensity of damage from light incidental contact with curbs and other roadway objects. The tire’s internal structure features polyester body plies for smooth operation combined with twin steel belts and a nylon cap ply which enhances tread stability and further increases durability. Towmax Vanguard tires have a Service Description that confirms each size earns an N speed rating therefore running the standard cold tire pressure recommended for the trailer and its load requires no additional adjustment in pressure for speeds up to the tire’s 87 mph 140 km/h maximum speed rating. Special purpose trailer tires are not UTQG rated.