[FussyZeus]

In the distro center I worked at, it was incredibly rare for the long haul trucks to actually attach the trailers to the building. They would jack up the trailers in the lot, let the truck go, then use a switcher to do the remaining lot because the switcher can just pick the thing up and go instead of having to have a worker there to wind the legs up and down on the trailer. Ours was not a huge distro hub either, pretty small one so I'd imagine larger ones have even more infrastructure to handle the freight that doesn't involve the pull truck.