(road transportation) A truck trailer designed to carry cattle, calves, sheep, hogs, goats, and other livestock. This type of trailer is not used for horses or poultry. Multi-deck options (two- and three-deck) are available for the transport of small, medium, and large animals. The standard axle/wheel configuration is 2-axle/8-wheel. For heavier loads, 3-axle/12-wheel or 4-axle/16-wheel configurations are available. Options include ventilation holes on sides, rear- and side-door design based on type of livestock to be transported, and interior ramps to lower, mid, and upper decks.