You guys are making this too hard. For cargo capacity, look at the Tire and Loading Information sticker on the driver's door frame...it's different for every truck. Don't forget to reduce that capacity by the weight of what ever items you've added to the truck....bed liner, extra fuel, 5th wheel hitch, passengers, etc. For tow capacity, subtract the GCWR minus the actual weight of the truck. To be safe, I use the GVWR of the truck, then you'll be covered.
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