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With town or service 60-80 miles, unless you are on steep hills a lot, just keep the standard brakes up. Dual circuit is great to have but a lot of work to change. If you expect to "flip the hubs" you must be thinking of going to singles, maybe use adapters. A3 wheels are kinda pricey...

Yea, definitely not a Cat.. not A3. The dual circuit brakes (and other goodies later incorporated in the A3) must give it away as a USAF. Comment on the dual circuit brakes (although I know most would keep the USAF truck entirely original), if they are the same as the A3, they are a 50-50...

How do you know the model.... that it is a USAF truck from the description? Is there years where that was most of the production? I'm not familiar with them, but isn't that the dual brake circuit model? Clearly not a cat.

You haven't said but the 87 would be an A3 model and have the Cat engine and Allison tranny, I think. Read about the tranny by searching key words before you make the decision. The OEM piston seals have some failure issues that eventually all of them are going to encounter. The 4th and...