What about just putting a jack on the outside? Like the kind they have on houseboats and some 5th wheel trailers? Stop at a big marine store and see what they've got. Rather than a box I think it might look cleaner.
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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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