A truck is a large, powerful, type of general-purpose automobile built for carrying heavy loads, commonly used on Earth during the 20th and 21st centuries. Typically they have a forward cab and engine compartment with a rear open box or cargo box used for carrying loads.
Edith Keeler was killed in 1930, when she was struck by a truck while crossing the street. (TOS: "The City on the Edge of Forever")
Gillian Taylor owned a Chevrolet truck, which she used to travel to and from work in. She also used it to pick-up Kirk and Spock as they walked from the Cetacean Institute to Golden Gate Park in 1986. (Star Trek IV: The Voyage Home)
Tom Paris and Tuvok "borrowed" a Dodge Ram from a car dealership so that they could travel around around Los Angeles, on Earth, in the year 1996. (VOY: "Future's End, Part I") Jonathan Archer would also steal a Dodge Ram when he and T'Pol visited Detroit, on Earth, in the year 2004. (ENT: "Carpenter Street")
In 2372, the crew of the USS Voyager discovered a fully functional 1936 Ford truck afloat in space in the Delta Quadrant. (VOY: "The 37's"
Even larger, more specialized trucks, known as semi-trucks or tractor trailers, are designed for towing significantly larger loads.
Dunbar used a semi-truck to transport, what the crew of the USS Voyager thought was the timeship Aeon, to a location in the California desert, thought to be the ship's launch site. (VOY: "Future's End, Part II")
