Are you sure you need to move the axle back? Lots of the HDT crowd (Heavy Duty Truck, the guys that use hdt's to pull their 5th wheel campers) have their 5th wheel hitches mounted well back from the rear axle. They say they like it better that way. Just wondering why you would need to move your axle back?
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'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
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