Abstract: A loading and unloading apparatus adapted for use on a wheel-supported trailer body is provided. The loading and unloading apparatus comprises a plurality of elongate support arms, a plurality of channels under the floor structure of the trailer body allowing the support arms to be mounted thereon and move longitudinally between a stored position and an operating position, at least one deck panel having two opposite end edge portions and means for securing the opposite end edge portions to the support arms. The opposite end edge portions are detachably mounted on the support arms.