On 2014-11-21, Pete C. wrote:

Those cranes do have computers monitoring and giving warning alarms, but
it's still possible for things to go bad too fast to react or to
miscalculate your load. If the computer gave them a load rating based on
the boom angle that was just a bit over the presumed weight of the tank,
and the tank snagged and added extra load mid lift it could well have
been all over by the time the operator recognized the alarm.

Exactly