GM, Ford Fudging Payload Ratings

Ah........the 'fine print' has it covered

* Maximum capacity when properly equipped. See your Ford dealer for specific equipment requirements and other limitations
* Note: The following chart lists GVWRs and Maximum Cargo Weights (with minimum equipment) by engine for each approved pickup model
* Requires Heavy-Duty Payload Package option.
* Requires Camper Package option.
* Content may vary depending on model, trim and/or powertrain.