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Transport trucks are non-highway, stationary dump trucks specifically designed for use in high-production mining and heavy-duty construction environments. Transport trucks are also used to transport construction equipment from site to site. Some are multi-axle to support towed equipment.

Most haul trucks have a two-axle design, but two well-known models from the 1970s, the 350T Terex Titan and 235T Wabco 3200/B, had three axles. [1] Transport truck capacities range from 40 short tons (36 long tons; 36 t) to 496 short tons (443 long tons; 450 t).

Large quarry-sized trucks range from 40 to 100 short tons (36 to 89 long tons; 36 to 91 t). A good example is the Caterpillar 775 (rated at 70 short tons [62 long tons; 64 tons]). [2] Quarry operations are typically smaller than, for example, a gold/copper mine and require smaller trucks.

The rear dropout configuration is an alternative attractive body style. Instead of raising the bed vertically, the hydraulic cylinder pushes an impact face horizontally across the body to unload the pulled load. 

Rear extraction dump vehicles were first produced by LeRoy Hagenbuch, Philippi-Hagenbuch, Inc. It was introduced by PE in the 1980s [6] for a garbage removal application in New York. They are designed to work on the Volvo BM truck chassis. While the functionality of the ejector bodies worked well, they were prone to maintenance issues and were not replicated until the 1990s. [citation needed] The next documented ejector bodies were developed by DDT, a British truck manufacturer. [7] A variation using a steel chain instead of a hydraulic ram was introduced by Bell, but did not become popular