I worked for UPS to get through college. UPS uses trailers with a moveable floor about 5'high, and the top floor of the truck has rollers running down the middle. First the bottom of the trailer is loaded (packed solid with no aisles) then the flaps(moveable floor pieces) are closed, then the rest of the trailer is loaded packed solid with no aisles. The goal is to pack the trailer as tightly as possible, like a giant 3D jigsaw puzzle. Big bulky stuff (bike frames) goes in the bottom of the trailer, where it is more likely to get squashed and stepped on by employees.
Unloading is done in reverse order, their loading docks have conveyer belts. All of this is manual labor, nothing is palletized.
I never saw anyone deliberately damage a package, the problems are inherent in their process. If you are building a stack of boxes you will be inclined to do it by size, so a 70 pound shoebox full of machine parts could end up on top of a stack of, oh, bike rims or such. If you open the flaps and jump into the bottom without looking, you could land on a box.
Oh yeah, remember all of this loading and unloading stuff is done as fast as you can move those boxes.




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