This spring I rented a Toto grinder. It worked like that one but it's smaller and the fee was $65/hr.
I worked great until I tried to use it on some newly cut poplar stumps. They were so wet that the grinder just slowly chewed them to mush. It took 5x longer than dry stumps.

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“In a time of deceit telling the truth is a revolutionary act.”
― George Orwell

It's not over when you lose. It's over when you quit.