http://www.caterpillar.com/en/company/history/leo/logging.html?utm_source=facebook&utm_campaign=CatProductsAccounts&utm_term=sf48205289&utm_medium=social&utm_content=Forestry&sf48205289=1
https://www.facebook.com/catproducts/
For more on big wheel logging: http://www.blackdiamondnow.net/black-diamond-now/2013/01/logging-with-big-wheels.html
Lumberjacks called the horse drawn version of these, "Kill-me-quicks". Probably much safer when towed by a heavy crawler than with a team of horses which almost certainly weighed less than the log being transported.
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