Abstract: A post carriage for a box-shaped cargo body having a cargo platform and two side bars extending along the cargo platform and supported on the platform by a plurality of posts including at least one post releasably secured to the platform and displaceable along a side bar, the post carriage including a connection plate for connecting the at least one post to the post carriage, a pair of track rollers displaceable along a guide rail provided on the side bar, and a roller trolley for supporting the track rollers.