If I recall correctly the Toy one-ton had six lugs on the hubs. I don't remember the axle ratio though. And the ones I saw on the lot when I was a lot boy, they were available as both singles and duallies, so what you wind up with can be stock either way.
I don't reckon I need to warn you away from trucks modified with dually "kits." That way lies trashed bearings.
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Lead or follow. Either is fine.
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