Fuel containers must be what to prevent jarring loose?

Fuel containers must be mounted to prevent them from jarring loose during transport or use. Mounting ensures that the containers remain securely in place, minimizing the risk of accidents and leaks that could result from movement. Proper mounting methods, such as using brackets or straps, help stabilize the containers, providing a safe environment for both operators and the surroundings. This practice is essential in maintaining safety standards within the propane industry, as it prevents potential hazards associated with loose containers. Other options, while they may contribute to safety in various ways, do not specifically address the issue of preventing fuel containers from becoming loose during handling or transport.