2 WD vs. 4WD vs. 6 WD

Does anybody know whether they are doing 2WD, 4WD, or 6 WD? Our team is having a great deal of trouble deciding which will work best and we were wondering if anybody had any suggestions that could lead us in the right direction.

http://www.chiefdelphi.com/forums/showthread.php?t=32659&highlight=4WD

http://www.chiefdelphi.com/forums/showthread.php?t=32069&highlight=4WD

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