What should you not attempt to do with a loaded MC-306/DOT-406 cargo tank?

The correct answer highlights the critical safety consideration involved with handling a loaded MC-306/DOT-406 cargo tank. Specifically, attempting to upright a loaded tank can be extremely dangerous due to the weight of the cargo and the risk of spillage or explosion if the contents are hazardous. Such tanks are designed to transport liquid materials; thus, if a loaded tank is overturned, it can lead to catastrophic accidents, including environmental contamination and personal harm.

Emptying, inspecting, and driving the tank, while still requiring caution and adherence to safety protocols, are generally acceptable actions as long as they are performed correctly and according to proper safety procedures and training. Appropriate handling techniques and safety measures must always be in place to mitigate any risks associated with those activities, particularly when dealing with hazardous materials. However, performing an action like uprighting a tank filled with liquids poses an immediate physical risk, making it something that should never be attempted under standard operating conditions.