Tons for a rough and ready answer, kilograms for a more accurate answer.
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kg. (kilograms), or tons (thousands of kg.).
centimeters
meters
The answer depends on what you wish to measure: its length (or width or height), its mass, it fuel efficiency, it maximum speed, its maximum acceleration, its tightest turning circle, its power output, its drag, etc.
You can use either unit of measurement.