How does an overloaded trailer, or one with an unusually high center of gravity, affect skid and rollover risk in a curve?

Correct answer to question 108 (Combination Vehicles): It increases the risk, since more weight positioned higher makes the vehicle less stable during a hard turn

Why

Cargo positioned high or an overloaded trailer raises the center of gravity, making the vehicle more likely to tip or lose control when cornering hard, even at a speed that would be fine for a lower, better-balanced load.