What is the golden rule of weight distribution when loading mixed freight into a heavy commercial truck cargo box?

1. Place heavy items on the bottom and centered between axles, place lighter items on top, and distribute weight evenly to prevent axle overloading or high center of gravity
2. Stack all heaviest steel items at the very top to keep them away from floor dust
3. Concentrate all heavy freight entirely over the right rear wheel to counterbalance the driver's weight
4. Place light cardboard boxes at the bottom and stack 5-tonne steel dies on top of them