The present invention provides an adjustable decking system for use within a cargo container. The system comprises vertical mounting posts that include a plurality of spaced openings and a slider track with obliquely angled guide channels. Decking beams are selectively adjustable in height along the posts by engaging the openings with end assemblies slidably disposed within the ends of the beams. The posts can accommodate alternative beam end configurations. One configuration includes a foot with angled guide edges slidably captured within the guide channels. An alternate configuration comprises coupled plates that fit directly into the openings and a swivel latched to provide a retaining force. This alternate configuration has an identical latch mechanism at both ends and is reversibly mountable within the decking beam.