DOT code trailers demand a level of product integrity unlike anywhere else in the world. Our certification and training processes insure that our craftsmen are up the challenge. Our designers' relationship with DOT inspectors and regulators insures our products exceed every code on the books. At Majona Steel, we take quality and safety to the extreme. If you are going to build DOT code vessels, nothing less will do. In the code trailer market, our specialty is the MC 312 and MC 331 tanker trailer.