What does the term 'lowboys' refer to in the context of trailers?

In the context of trailers, the term 'lowboys' specifically refers to low-profile trailers that are designed primarily for transporting heavy equipment. The key characteristic of lowboys is their low height, which allows them to accommodate taller loads while remaining under bridge height limits. This low profile is essential when dealing with oversized equipment that needs to be transported securely and legally.

Lowboys often feature a drop in their frame, which further reduces their height and increases stability when transporting heavy machinery. They are commonly used for transporting excavators, bulldozers, and other large construction equipment, making them an essential tool in the logistics of heavy hauling.

The other options do not accurately capture the essence of lowboys. High-capacity trailers and flatbed trailers serve different purposes and are designed differently than lowboys, while trailers designed for small cargo do not have the necessary features to handle the weight and dimensions typically associated with lowboy transport needs.