Which wheels are powered by the engine in an 18-wheeler?

The engine in the 18-wheeler power the two rear axles, or wheels. This is because the trailer's weight is often too much for the front wheels to bear. Having the engine power the rear wheels helps to distribute the weight more evenly and prevents the truck from becoming overloaded. The engine does not power the other wheels, but they help support the truck's weight and keep it stable on the road.

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