[Landing Gear, Trailer Axles, Trailer Stabilizing Jacks, Slick Disc] In business since 1958, Butler Products designs, manufactures, and distributes jacks and couplers for trailers, agricultural implements, loading dock safety equipment, and a wide variety of specialty applications. Previously located in Kentucky, Butler Products currently has manufacturing and assembly facilities in Houston, Texas and Shanghai, China as well as distribution center coverage in all major global markets.