Haul truck in Quebec, Canada, with people for scale
Haul trucks are off-highway, rigid dump trucks specifically engineered for use in high-production mining and heavy-duty construction environments. Most have a two-axle design, but two very well known models from the 1970s, the 350T TerexTitan and 235TWabco 3200/B, had three axles.  Haul truck capacities range from 40 short tons (36 t) to 400 short tons (363 t).
Large quarry-sized trucks range from 40 to 100 tons. A good example of this is the Caterpillar 775 (rated at 70 short tons (64 t)). Quarry operations are typically smaller than, say, a gold/copper mine, and require smaller trucks.
The largest, highest-payload-capacity haul trucks are referred to as ultra class trucks. The ultra class includes all haul trucks with a payload capacity of 300 short tons (272 t) or greater. As of October 2013[update], the BelAZ 75710 has the highest payload capacity, 450 metric tons.
Orleman, Eric C. (2000-11-10). Johnson, Paul, ed. Building Giant Earthmovers. Motorbooks Colortech. United State of America: MBI Publishing Company. ISBN978-0-7603-0640-6. Retrieved 2010-03-02. "The ultra-hauler class includes trucks with a capacity rating of 300 tons and above."