ML> would a 4 wheel drive dually truck actually be a 6 wheel drive? should it
 ML> actually be known as a 4x6 or 6x4 because of the two extra rear drive
 ML> wheels??

A 6 Wheeler is configured as: 2 wheels at the front and 4 at the rear,
                              1 x axle ^   ^    ^    ^  2 at the rear.
                              Rear axles will have 'Dual Wheels'.

That's the story here in OZ, anyway

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