Section 17 Vehicles, aircraft, vessels and associated transport equipment 87 Vehicles others than railway or tramway rolling-stock, and parts and accessories thereof 87 16 Trailers and semi-trailers; other vehicles, not mechanically propelled; parts thereof. 87 16 20 Self-loading or self-unloading trailers and semi-trailers for agricultural purposes Commodity Code Description 87 16 20 00 Self-loading or self-unloading trailers and semi-trailers for agricultural purposes