How are open-top containers designed to assist with loading?

Open-top containers are specifically designed to facilitate the loading of oversized cargo that cannot fit through standard container openings. The option highlighting the end door that functions as a ramp is significant because it allows for easier access for loading and unloading larger items. By incorporating a door that can swing open and act like a ramp, it simplifies the process of rolling in or out cargo, especially heavy or bulky loads. This design feature is crucial in intermodal transport, where efficiency in loading and unloading can significantly affect overall logistics and cost management.

In contrast, while options like rigging attachments, pneumatic lifting systems, and built-in lifts represent possible methods for moving cargo, they do not align with the unique design purpose of open-top containers. Open-top containers primarily depend on their structural design to accommodate easier access rather than employing these additional mechanisms for enhanced loading efficiency.