They could add that, or "hired help" in the form of you pulling into the shop and the truck being emptied by the "hired help" (you pull in and the truck is emptied, with everything being in its place")

Problem is that the items are free floating instead of utilizing the snapping mechanic, so having to manually load and balance them onto the jack just adds another unnecessary layer to the unloading and shelving process. If all the items snapped together neatly and you can use the jack to move a whole stack of them with one click, then it's an efficient operation. Otherwise hired workers would be more efficient in this process.