Tractor with a petrol tanker

Tank container chassis, also referred to as tank chassis, drop frame chassis or tank trailers, are a form of intermodal transportation for portable bulk liquid containers or ISO tank containers. They are characteristically longer and have lower deck height ideal for transporting constantly shifting payloads. The invention of the tank container revolutionized the way bulk liquids were transported, stored, and handled worldwide. It has improved safety, reduced costs and brought with it the benefits of convenience and efficiency associated with a multi-modal transport system. Invariably the invention of the drop frame chassis followed soon after to accommodate this new type of intermodal container. [Tank chassis. Wikipedia]