I've seen travel trailers mounted to the frame of a class 8 truck. The one I looked at was kind of a amature job. But it looked road worthy. I don't know about a 5th wheel tho. That step up portion might be more difficult to deal with. Why not just use a bumper pull type trailer with a completely flat frame?
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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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