Truck hijackings have dropped over the last several years. This is most likely due to security measures such as GPS tracking that have recently become available for trucking firms. My friends business operates several trucks for delivering their merchandise and he can monitor the location of all his trucks. He can even receive alerts if a truck leaves a defined area or stops for too long.
People always talk about how the transponder on ships can be easily tampered with whenever I mention how a transponder helps limit piracy and skipping, so I won't mention it again here.