3200 was a rare example of a tri-axle haul truck configuration 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. Haul truck capacities range from to nearly . An example on the smaller end is the Caterpillar 775 (rated at ).
Quarry operations (which produce payloads that have value) typically employ smaller trucks than mining operations (such as removing undesirable overburden, an expense). Haul trucks can generally be distinguished from standard dump trucks by: • Being far too large to travel legally on public roads • Having a dump body made of exceptionally strong steel plate that extends over the cab to protect it, angled upright at its end (or entirely) to aid in dumping; some are heated by exhaust gases to prevent loads from sticking or freezing to the bed; • Having a driver's cab narrower than its body; • No axle suspension; • Limited speed and operating range; • Special off-road only tires; • A ratio of dead weight to payload not exceeding 1:1.6 Most large haul trucks use some form of
traction motors coupled to
regenerative braking for power, braking, or both. Haul trucks are classified by: • Type of unloading (dump or rear-eject); • Direction of discharge (side, rear); • Type of body (hopper, platform, sliding hopper, sliding platform). ==Ultra class==