Sounds like way too much work and expense for what you'll get in the end. There are soo many trucks available that would make a better starting point aren't there? You could get a used box truck like RanD did and put everything inside.
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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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