What is the proper method for securing loose straw, hay, or firewood on an animal cart to prevent road spills?

1. Leave cargo loose and rely on gravity
2. Lash the load firmly with heavy ropes or tie-down straps cross-lashed to cart anchor rings, cover with a tight tarpaulin if transporting loose straw or sand, and verify the load is balanced without exceeding vehicle width
3. Stack cargo beyond 4 meters width
4. Tie cargo to the horse's ears