There are several steel coating and processing plants around here and we see a lot of flatbeds with 4' - 6' diameter rolls of steel. My kids used to ask why they didn't carry more rolls than just one on that big trailer. I showed them an empty flatbed and pointed out the upward curve of the trailer then one that was loaded with one roll and the slight downward curve due to the extreme weight.
One of my childhood friends had a father that hauled roll stock between locations. On his last trip someone pulled out in front of him in a delivery truck. He slammed on the brakes but when he hit the other truck the roll broke loose and rolled the cab flat including both drivers. The only good part was the second truck stopped the roll so no one else died. The laws of physics are suspended for no one.