How many people can the stacker accommodate in addition to the stacker driver?

The correct answer highlights the strict safety regulations governing the use of stackers, which are designed to ensure both the operator's safety and the integrity of the lifting equipment. Stackers are typically intended for use by a single operator, emphasizing that no additional personnel should be on the equipment during operation. This is crucial because having extra individuals in a stacker can significantly increase the risk of accidents, including tipping over or losing control of the load being handled.

In environments where stackers are used, adhering to this guideline helps maintain a safe working environment and minimizes the potential for injuries. The design and structure of stackers are not meant to support additional weight from extra passengers; therefore, operational safety standards clearly dictate that only the driver is allowed on the stacker.