What is the danger of carrying heavy cargo that has a very high center of gravity (such as stacked timber or high machinery)?

1. It dramatically lowers the vehicle's rollover threshold, causing the truck to flip over during normal speed cornering or sudden swerves
2. It causes the engine oil pressure to drop to zero
3. It causes the steering wheel to vibrate at 10 km/h
4. It makes the headlights shine too high