An adjustable decking system for use in supporting freight is provided. The system includes a pair of tracks configured to be vertically mounted upon opposite walls of a freight container, configured with a plurality of evenly spaced recesses disposed along the length thereof. A bracket is slidably mounted upon the pair of tracks and a lock is pivotably mounted to the bracket and an end of the channel unit. The lock includes first, second, and third fingers extending therefrom which are normally received within three of the plurality of spaced recesses disposed along the track. The lock is being pivotably mounted to the bracket such that the first, second, and third fingers may be withdrawn from the three of the plurality of spaced recesses to allow the position of the channel unit to be vertically adjusted along the one of the pair of tracks.