When starting to move a loaded tractor-trailer, the vehicle should be put in what gear?

When starting to move a loaded tractor-trailer, it's crucial to use the lowest available gear. This is because a loaded tractor-trailer has a significant amount of weight, and using a lower gear provides the necessary torque and power to start moving the vehicle smoothly and safely.

Using the lowest gear allows for better control of the vehicle's acceleration and minimizes the risk of stalling, which can occur if a higher gear is used. This approach also helps in maintaining balance and stability, especially when the vehicle is starting on an incline or a slippery surface. Additionally, it reduces the strain on the engine and transmission system, contributing to the longevity and efficiency of the vehicle.

Overall, selecting the lowest gear is critical for effective control and safety when initiating movement with a loaded tractor-trailer.