Abstract: The present invention is a decking system that provides a height adjustable, sectional second floor in a semi-trailer for hauling freight. The system utilizes vertical tracks mounted on the inside of each side of the trailer. Each track on one side of the trailer is transversely aligned with a corresponding track on the opposite side of the trailer. E-bars are secured to and between opposed corresponding tracks for adjustable, vertical movement. Deck sections are mounted on the E-bars to support cargo. The deck sections may be positioned all at the same height or at different heights or may be inclined to form a ramp for loading or unloading cargo.