I work at wal-mart, we use these for unloading multiple trucks. You basically have these trailers filled to the brim with stuff most people won’t buy and somethings we never have. We have about 6 of these laying around which are connectable, so you just roll boxes and boxes down the line til it hits the ned which we place the items on pallets according to which department they go to. Then wheel them out to the floor for night stockers to stock