Why is it necessary to observe the load distribution plan?

The combination you selected is correct because it addresses two important aspects of load distribution according to German traffic regulations.

1. Preventing exceeding the axle loads is critical for safety and compliance with legal weight limits. Overloading an axle can damage the vehicle and pose a danger to other road users.

2. Ensuring that steering capacity is maintained is essential for maneuverability and control of the vehicle. Proper load distribution affects how the vehicle handles, especially in turns or during sudden braking.

However, the third option, while practical for operational efficiency, is not directly related to safety or legal regulations. While making loading and unloading easier is beneficial, it doesn't impact vehicle stability or compliance with traffic laws. Therefore, focusing on safety-related factors is crucial when considering load distribution in accordance with German traffic rules.