Shandong UT Trailer Parts Co., Ltd. Make full ranges of spare parts for semi-trailers: A. Mechanical suspension: Casting or welded type. American style ... . J. Turntable for semi-trailers and fully trailers. K. Draw bar eye for dolly connection or full trailer L. Trailer coupling for dolly ... -22.5, 8.25-22.5 N. Brake Chamber for semi-trailer, full series. T20, T24, T30 single brake chamber. T24/30 ...