In 1988 I was jobbing in the company, my father worked for. We had to clear off a storehouse, which was full with shelfs with old paper-files. Because they included privacy datas, we had put all into lockable, rollable aluminium-containers, and then roll them onto a 7.5-ton-truck.
The previous jobbers really managed it, to damage on of these truck. After they filled it completely with paper, the back axle cracked