Yes, you're not going to be able to put anything in a 22' box that's too heavy for tandem drive axles. My truck has a single rear axle, 295" wheelbase, front axle is 12k with full fuel tanks and two 200 lb. guys in the front seats, rear axle is 17k lbs. with full water. 26' living quarters, one smallish slide.
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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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