Under StVO § 101, what are the driver's legal obligations regarding securing agricultural cargo (such as silage, grain, or loose hay) on a trailer?

1. Loose bulk loads need no securing where the journey is shorter than 5 km
2. Securing is required only for loads carried above the height of the sideboards
3. Bulk loads such as grain need no cover provided the sideboards are higher than the load
4. The load must be secured against falling off, spilling or being blown away, using sideboards, tarpaulins, nets or lashings as appropriate