What is the common name for a truck's back bumper?

The common name for a truck's back bumper is often referred to as a "face bar bumper." This terminology originates from the design and function of the bumper, which is classified as a protective element at the rear of the vehicle. The face bar bumper serves to absorb impact during minor collisions, helping to protect the rear body structure and safety systems of the truck, while also providing a mounting point for accessories like towing attachments or steps.

In contrast, while "rear guard" may be used in informal contexts or discussions, it is not the widely accepted technical or common name for the bumper itself. "Chassis protector" typically refers to components that safeguard the vehicle's undercarriage or frame but does not specifically denote the back bumper. Similarly, "bumper cover" describes the outer cladding that may adorn the bumper but does not represent the bumper itself. Understanding these distinctions clarifies why the term "face bar bumper" is the appropriate answer.