The bottom of the Rear bumper should be a minimum of 2 1/2 inches from the ground. From the ground to the top of the bumper should be no more than 13 inches maximum. Spacing from the rear tire minimum 2 inches, maximum 4 inches. Bumper should be centered on chasis.
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GRUBDIGGER
This is straight from ther ARMA web site as posted by Techman John Herring.