Majona Steel is a 3rd generation steel fabrication and manufacturing company located in Osceola, Iowa. We have a reputation for both quality and value. You will see on our website tank trailers, pressure vessels and custom steel storage tank systems. We are ASME certified to produce pressure vessels up to 10,000 psi. We hold an R stamp and U stamp certification. We are also DOT certified to build and register our trailer equipment. We manufacture: LP Transport** 11,600 Gallon- DOT code MC331 5000 Gallon Aq-HF Trailers - DOT Code 412 130 bbl Water Vac Trailers - Non code 160 bbl Water Vac Trailers - Non code 190 bbl water Vac Trailers - Non code Kill Trailers (water) Non code 130 Bbl Heavy Duty HCL Trailers - DOT Code 412 5000 Gallon Standard Transport HCL Trailers - DOT Code 412