Doing 4 wind mits the furthest one 1 hour South of me then getting to the office and having your SD card crash. If you have a laptop with you I would upload all you photos to it before leaving the site.
3 weeks ago I had a CF card crash after a modeling shoot and today a SD card after my full day of work.
I take very good care of them but it seems that they do wear out.
Just venting no help needed. If you have a camera that can save to 2 cards at once like my big camera I would definitely do it.