The Doepker Classic Tridem Steel 3 Hopper is the open-end triple hopper that changed the industry when it debuted in 1997. Three 14-gauge steel hoppers with rack & pinion chutes sit beneath 16-gauge steel walls with 4" vertical corrugations, an engineered steel construction that holds its own on payload against aluminum alternatives. It is offered in 45' for standard tandem-drive trucks or 46'3" for tri-drive applications, and the three-hopper layout lets an operator haul three separate commodities in a single trailer load.