You want to have 34' overall length on the coach? A day cab truck is going to be at least 10' front bumper to back of cab. That leaves you 24' for the living quarters. Now, you want a garage in there? Doesn't sound like much space left for living quarters. Pretty sure a 34' coach isn't going to need tandem drive axles. You can put a single rear axle rated at 22,700 lbs. (that's what my rear axle is rated) and I don't think you're going to be able to overload that with that short of a coach. With a single axle you have more room for storage and utilities.
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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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