At least at my barn not only under vitran but also under PJAX corporate bought so many jacks in a 5 year period that they finally said no more (over 50 jacks for 45 drivers) we would have drivers leave them on trailers when they dropped them at auto plants, drive down the road with swing doors open and shoot them out the back, take the off at customers and forget to put them back on, or have dockworkers thinking the were funny and intentionally run them over with the hilos ( I actually saw one dockworker( a senior one none the less) get a jack up in the steer tire of the hilo and keep running it over till it looked like a pretzel all the time laughing) so basically if you wanted one you either bought your own or stole one from a customer (hopefully without getting caught) then locked it up where hilos couldn't get near them, of course that didn't stop dispatch or management from cutting your chain or lock to get at the jack.