Heavy-duty self-propelled trucks are considered transport wonders. Their engines have more than five hundred horsepower and their agile chassis has eight wheels per axle line. This allows them to drive not only forwards and backwards, but also sideways and diagonally. Whether steep inclines, steep declines or difficult surfaces, they are true off-road professionals. They can move loads up to seven times their own weight. They are used when other transport systems fail.

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