Up to 40 ft. There isn't a set, specified length for it. Purchasers will order the truck and go with a wheelbase which suits them best. For example, in North Carolina, you gain 500 lbs. of legal GVW for each foot of wheelbase, up to a set specified weight limit for each configuration (I remember the max for a quad axle was 65,000... don't remember offhand what it is for a tri-axle).
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