| || Well, that's not its name ... but ...
The term "Earth Kingdom supply truck" has not been confirmed by official sources.
Earth Kingdom supply trucks are treaded supply vehicles designed by the mechanist and fabricated at the Northern Air Temple. They were used along with numerous other vehicles and equipment in the Invasion of the Fire Nation, where they were primarily utilized to transport and supply earth and water for the bending factions of the invasion force.
At least eight of these trucks, driven by Earth Kingdom soldiers, participated in the Invasion of the Fire Nation on the Day of Black Sun. They advanced alongside the benders, supplying water and boulders for use as weapons against the enemy. Trucks carrying fire bombs were used to blast holes in the walls separating the Royal Plaza from the Capital City, providing paths for the invaders. These trucks ensured that the invaders had a ready supply of bending material during the battle.
These vehicles are designed to carry weapons and bendable elements for use by the warriors and benders who made up the invasion force. Each truck is operated by a single driver, made entirely of metal, and possesses a large flatbed able to carry earthen boulders, jugs of water, fire bombs, and other weaponry.
These trucks bear a resemblance to tractor vehicles used by different factions during World War II, such as the Russian Voroshilovets heavy artillery tractor. They are similar in design to real-world open-tray dump trucks, as they have an open cabin, and they operate similarly to real-world trucks, with the exception of the treads.
- This is one of the first signs of modern transportation through motorized vehicles prior to The Legend of Korra.