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On a cutaway, there should be a decal with that info from the company that finished the vehicle. They are considered incomplete when they leave Ford factory.
Thanks for the responses, but I'm trying to compare the differences between single and dual rear wheel ratings and I don't have a dually to look at.
Look at the weight rating on your tires, they usually have the rating for duals on there. That'll give you an idea. The dual rating would be multiplied by 4 for the total on the rear axle. A dually suspension on heavy trucks is usually somewhat heavier than the total allowed by the states and feds, not sure about light trucks.