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This example has a cargo capacity of 2051 pounds.
Look at the yellow sticker on your drivers door. These are specific ratings for your truck. There will be a number that shows you the max cargo capacity of your truck. This number is how much cargo your truck can handle. This number includes a tank of gas (26 gallons) and the driver weight. Any other weight you add will have to be deducted from this weight. So that is weight in the bed of the truck, other passengers and the hitch weight of the trailer and the weight of any WDH you will add. There will also be weights for front and rear axle. You will find you will run out of cargo weight way before you run out of trailer weight on some of the 1/2 tons. You can figure the hitch of the trailer will be any where from 13 - 15% of the GVWR