What is the primary danger when carrying livestock (cattle, sheep) in a commercial transport vehicle?

1. Live animals shift their weight unpredictably during turns and braking, causing sudden shifts in vehicle center of gravity and rollover
2. Animals distribute themselves evenly, so livestock behaves like a well-blocked solid load
3. Livestock weigh less than freight, so the centre of gravity is always low
4. Because animals are loaded loose rather than strapped, no securing precautions apply