Why is it necessary to observe the load distribution plan?

You answered correctly. Observing the load distribution plan is important because it helps prevent the axle loads from being exceeded and ensures that the steering remains controllable. This is essential for vehicle safety and legal compliance. If the weight is not properly distributed, certain axles could become overloaded, which is not allowed, and the vehicle might become difficult to steer or even dangerous to drive. Making loading and unloading easier is not a safety requirement, so this is not a reason for following the load distribution plan. Always follow the plan to keep control of the vehicle and avoid overstressing the axles.