Is a cargo body type for trailers with a fixed middle beam and side support posts specifically designed for carrying logs. If the trailer can "telescope" to carry different log lengths, then it should be considered a pole trailer.
Is a cargo body type used for a trailer specifically designed to have a rail or ship container mounted directly on the chassis. These should not be confused with van/enclosed box cargo body types. Intermodal containers may also be mounted on a flatbed trailer, in which case "flatbed" is the cargo body type.