Its adaptive air suspension, full-time all-wheel drive, locking differentials and extra-low range all combine to make the Range Rover capable of going just about anywhere you'd think to try and drive, and to conquer some slopes you couldn't ascend without a climbing rope.

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The mighty 12 is backed up by an eight-speed transmission and Audi's Quattro all-wheel drive system (with electrically locking front and rear differentials, no less).

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Ted Scott, the American Trucking Association's director of engineering, said an automatic locking device secures the pin into the fifth wheel.

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