Bulk loads are large freight loads hauled by trucks and trailers designed and built to carry a large amount of liquid or dry freight in bulk. Bulk loads are typically unloaded using a conveyor, walking floors, and walking hopper bottoms. Bulk load trailers are also referred to as hopper bottom and pneumatic trailers. There are many different kinds of bulk loads. Most often, they consist of commodities that come in bulk. Some good examples are agricultural commodities, such as animal feed ingredients, fertilizer aggregates, grain, etc.