Most of the truck conversions I've seen with two rear axles have both of those as drive axles. I think Showhauler is just finishing up a build on one where they have a tag axle behind the drive axle. But that's the only one I've seen that way. If you build yours from scratch you would have the option to spec it any way you wanted. wmbillh, are you wondering if you should stay away from a twin screw (two drive axles)?
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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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