The improved composite panel trailer sidewall of the present invention provides a recessed groove or a pair of recessed grooves on the interior of the panel that are spaced apart from the edges of the panel. Slots are cut in the composite panel in the recessed groove or between the recessed grooves. An interior vertical support having logistics slots is seated in the recessed groove or grooves to provide additional locations to secure and divide cargo without creating snag points in the interior of the trailer.