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A semi truck is a combination of a powered truck and one or more trailers. It is also known as a tractor-trailer and is a versatile piece of commercial transportation. The tractor unit typically has two or three axles, although some are built with up to five. A common tractor-cab layout has a forward engine …

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If you’re thinking of buying a used truck, you need to know the exact model year. In the United States, trucks must be 10 years old or newer to be registered. Trucks older than this will need CARB permission to register. You’ll need to take a photo of the Emission Control Label and engine compartment …

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