I don't understand your question. Didn't you just determine how much various other vehicles you didn't purchase had for payload? How did you know one truck had 2300 pounds of payload, another had 2000?
The Tire and Loading sticker is designed to do exactly that, provide payload on each vehicle as equipped from the factory as well as tire pressures to support that weight. It is one result from the Ford Explorer/Firestone debacle 10+ years ago when consumers claimed they didn't know how much weight they could add to their vehicles or what pressures to use in the tires.