Final answer:
The key principles in loading any cargo on a commercial vehicle are vehicle balance and stability, cost-effectiveness, and driver comfort.
Step-by-step explanation:
The key principles in loading any cargo on a commercial vehicle are vehicle balance and stability, cost-effectiveness, and driver comfort. Ensuring that the cargo is evenly distributed and properly secured on the vehicle helps maintain balance and stability during transportation, which enhances safety. Additionally, optimizing the cargo load to maximize efficiency and minimize expenses contributes to cost-effectiveness. Finally, considering the driver's comfort by avoiding overloading or unevenly distributed cargo can help prevent fatigue and ensure safe driving.