Fighting forest crime in Guatemala

If you drive them at a low height, it will break chainsaws, and disrupt lumber operations. If you drive them at a higher height, it won't disrupt the harvesting, but will produce a truly spectacular surprise at the sawmill that processes the lumber. If done a few years before logging operations, it is almost undetectable.

Having a $10,000 sawblade ruined, and a work line being taken out of service until the blade can be replaced seriously sours lumberyards on the prospect of dealing with spiked wood.

Of course, the spikers will be called lunatics, eco-terrorists, communists, job-killers, worker-killers, and every possible effort will be taken by the authorities to hunt them down like dogs. Tree spiking is a felony in the United States, and, given the track record of how resource firms tend to deal with environmental/native/land rights activists in developing nations (quickly, and violently), is almost certainly a 'needs killin' offense' in much of Central and South America.