I just did a search for tag axles on truckpartsinventory.com and found quite a few: Truck Equipment/Accessories | Tag Axles - Truck Parts Inventory - Heavy duty truck parts results
Looks like these axles are up in the 10-20k lbs range. So, you'd only need two of them. One of them I saw said 34" chassis width. I'd guess that would be pretty standard. How does that compare with your 5th 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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