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Nothing in the VIN identifies the wheelbase. The wheelbase, unfortunately, can be found on the vehicle certification label in the driver's door jamb, but by that time you already know whether it's a longbed or shortbed by just looking at the truck.
I think you can only get them in the CC configuration. Personally, I think a regular or super cab shortbed dually 4x4 would be one of the coolest looking trucks on the road.
If you are looking online at new trucks via ford.com, look at the exterior options tab.
If it says 29 gallon gas tank, it's usually a short bed. The long beds usually have the 38 gallon tank.