The term 'Heavy-Duty Truck' refers to a type of vehicle that is designed to transport large and heavy loads. The crossword solution for this term is 'Flatbed, ' which is a type of truck that has an open, flat bed at the back for carrying cargo. Flatbed trucks are often used for hauling large and bulky items such as construction materials, furniture, and machinery. They are also commonly used in the agricultural industry for transporting hay, livestock, and other farm equipment.