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Find the Gross Vehicle weight rating. It should posted on the driver side door jam. Have the truck weighed at a weigh station to determine the unloaded weight.
(gross weight - unloaded weight) = Payload. This is how much you can LEGALLY carry.
You can roughly estimate the unloaded weight by using the base factory curb weight ( no options) and factoring in the additional weight of options such as AC, automatic, bedliner etc...
The base curb weight on mine is 3955#. GVWR is 6250.