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COMMENT: It’s time to debate the Class 8 double-drive

BY ALAN BUNTING. Payload benefit could see popularity of single-drive heavies increase in North America

In the United States and Canada, three-axled heavy-duty articulated tractors are the norm. Coupled to tandem-axled semi-trailers, they meet Class 8 regulatory requirements for gross combination weights up to the US federal maximum of 80,000lb (36.3 tonnes) – though some individual states allow higher weights, subject to specified axle spacing rules.

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