Posted by David North on November 3, 2011  The trucks on that derrick look as though they aren't rigid, do they swivel? I've never seen 6 axle trucks like that Posted by Erick Anderson on November 3, 2011  I think the joints in the middle of the trucks are to allow vertical movement, not horizontal. Posted by Jake McGarvie on November 9, 2011  always a good capture when you can see the "Big Hook" in action.

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