A pneumatic locking system configured to secure a container to a vehicle chassis. The locking system can include a hook pivotable between an unlocked orientation and a locked orientation relative to the chassis and an inflatable bellows intermediate the hook and the chassis, wherein inflation of the inflatable bellows is configured to pivot the hook from the unlocked orientation to the locked orientation. The locking system can further include an air line system fluidically coupled to the inflatable bellows and an air supply system. The air line system can include a valve controllable by a switch, wherein actuation of the valve is configured to supply air from the air supply system to the inflatable bellows and pivot the hook to the locked orientation.