They can dump from the back, which is most common, from the sides, and/or from the bottom.
Even though the Department of Transportation (DOT), oversees and regulates everything transportation related, they don’t have a special classification for dump trucks.
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The Federal Highway Administration (FHWA), does have classifications for commercial vehicles though. Most commonly seen dump trucks are either class 7 or class 8, however, class 6 dump trucks do exist.
The modern dump truck has actually evolved from wagons designed in the late 19th century. In the US trucking history says that the first motorized dump trucks were designed around 1910, with hydraulic designs soon to follow.
Like so many vehicles, the dump truck designs were tested and developed during World War one, and soon after were made available to the general public for private commercial use.
