Patent ID: 8491030

Claim:
A combination trailer, comprising: a rear self-discharge trailer having a bottom surface, a front portion, a back portion, and two opposing side panels, the side panels having a height that is less than the height of the front portion; an enclosure system adapted to selectively cover an open top of the rear self-discharge trailer; at least one locking pin assembly attached to one of the side panels of the rear self-discharge trailer, the locking pin assembly for securing the enclosure system in a desired position; a pair of internal rails positioned on the bottom surface of the rear self-discharge trailer and connected to the opposing side panels of the rear self-discharge trailer by a plurality of posts, each of the posts spaced at a predetermined distance from each adjacent post; and an adjustable bulkhead for securing a load in the rear self-discharge trailer, the adjustable bulkhead including a center panel secured between two opposing side members, the side members having a hooked bottom portion adapted to be slidably disposed over the posts such that the adjustable bulkhead can be positioned at a desired location in the rear self-discharge trailer.