Grain, Chips, Gravel:
Is a cargo body type used for hauling these or other similar bulk commodities. They may be referred to as "open hoppers" or "belly dumps".
Pole:
Is a cargo body type that consists of a trailer designed to be attached to a towing vehicle by a reach or pole or by being boomed and secured to the towing vehicle. These are ordinarily used to carry property of a long or irregular shape, such as telephone poles. The "pole" extends or retracts to accommodate varying lengths of cargo.