The Doepker Tridem Cross Dump is the belly dump road builders depend on for precision aggregate placement, with adjustable hopper stopper gates that close under load so material goes exactly where the crew wants it. A 6-inch composite air cylinder drives two hoppers with 17"×93" openings each, and a dedicated 60-gallon air tank keeps pressure consistent through the longest shifts. At 38'6" and a 43,100 kg GVWR it moves approximately 28 cubic yards per load, with a manual override that keeps the gates working even without air pressure.