The pins may break under strain on a dry rocky trail, but that is not usually the reason for them breaking. The spider gears are a straight metal to metal contact with the pin. They are not designed to spin at any great speed or for any length of time. Any spinning of wheels causes the spider gears to eat into the pin. This either weakens the pin for breakage at a future date or the spider gear will weld itself to the pin and break there and then.
You can usually inspect the state of the pins by looking through the filler plug. But if your diff oil shows signs of being overheated, there is a good chance that it is already past its use by date.
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