Kings of the road depend on Quality Trailer Products. Quality Trailer Products makes and distributes parts used to make and repair light- and medium-duty trailers, including boat, livestock, and equipment trailers. Its 20,000-plus lineup offers trailer axles and brakes along with fenders and commercial wheels of all sizes. Quality Trailer Products assembles parts from four plants, and caters to customers from 19 service branches. Agriculture and industrial customers on the west coast who demand heavy duty wheels are served by the company's Century Wheel and Rim division. Quality Trailer Products was founded in 1969 and has operated as a subsidiary of tank trailer-maker Polar Corporation since 2004.