Dropdeck

A dropdeck is a type of semi-trailer that features a lower deck behind the gooseneck section. This distinctive design creates a lower cargo platform compared to conventional trailers, hence the name "dropdeck." The main advantage of this configuration is its ability to accommodate taller loads without exceeding legal height restrictions. This makes dropdecks particularly useful for transporting oversized equipment, machinery, or construction materials.

The lower deck section typically measures significantly lower than the main trailer bed, offering a substantial increase in vertical clearance. The gooseneck portion connects to the tractor unit and sits above the trailer's main deck, a design that allows for the depressed cargo area. Dropdecks can be either fixed or detachable, with detachable goosenecks offering greater versatility for loading and unloading.

Various types of dropdecks exist, including single drop, double drop, and stretch dropdeck trailers, each offering different configurations and capacities for specialized hauling needs. The construction of dropdecks usually involves robust steel frames to support heavy payloads. When not in use for tall loads, the lower deck can be used like a standard trailer bed, although the access ramp might be longer due to the drop in height.