The Doepker Tridem Clam Dump is the belly dump road builders rely on for laying material at a controlled rate, and its air-operated stopper gates close under load so discharge stays precise from start to finish. Two models cover the full range of applications: a 38'6" standard and a 42' tri-drive setup delivering up to 30 cubic yards with 10" side boards. An oscillating upper fifth wheel with 16" king pin lets the same trailer run behind tandem drive or tri-drive tractors.