Which TWO cargo transfer methods can be used with all types of MC-306/DOT-406 tanks?

The response is accurate since internal valves and loading/unloading lines are designed into the structure of MC-306/DOT-406 tanks, which are specifically engineered for transporting hazardous liquids. The internal valves allow for secure and controlled transfer of liquids, minimizing the risk of a leak during loading and unloading operations. Additionally, the loading/unloading lines facilitate the transfer process by providing a safe and efficient pathway for the cargo, ensuring compliance with safety regulations and the integrity of the materials being transported.

Other methods, while potentially useful in other contexts or specific situations, may not be universally applicable or safe for all types of MC-306/DOT-406 tanks. Therefore, the internal valves and established loading/unloading lines offer a reliable and regulated means of transferring contents from these specialized tanks.