Abstract: An automatic, pneumatically operated flatrack lockdown device is provided for a palletized load system trailer. The lockdown device includes a manual release system which can override the pneumatic system when, for example, the pneumatic system fails. The release system includes a main handle, which when pivoted unlocks the flatrack. In one embodiment, the release system further includes a locking assembly which prevents the main handle from unlocking the flatrack , and a pair of release handles, each of which release the locking assembly to allow for operation of the main handle.