That's not true, payload is a real number, with legal ramifications. There are examples of trucks with payload less than GVWR- base weight as well, that is not always how they calculate payload. The GRAWR is taken into account in some instances.
If you want to know what's PR and what isn't, look at your door stickers.
Wrong wrong wrong, the grawr is NOT ever taken into account for a gvwr lol, not on a half t ram pickup. A payload is not, under any circumstances a legal anything, the payload is dynamic, it changes with every truck on the road, payload is not posted on a sticker anywhere, and it's not listed on any websites, period, it can't be. You either don't understand math, or how measurements work, or both. Payload is an end result of a mathematical equation, gvwr minus vehicle weight. It doesn't matter how you do it , or your neighbor does it, it matters how the manufacturer does it, and that's how they do it. Saying otherwise is wrong, incorrect, and when you blatantly argue opposite just to argue, even ignorant.
What you're saying doesn't even make sense. A gvwr is literally the gross weight the truck can weigh, grawr is it's own measurement of a rear axle rating, you can't conclude a payload based off the rear axle because rear axles are always rated higher than the manufacturer states. For instance my ram has a 3900 front and rear axle rating, yet the gbwr is only 6900 pounds, 3900 plus 3900 is not 6900, the rear axle rating only comes into factor if you don't overload the gvwr which is almost always lower than the front and rear axle rating combined. I could in theory stay under my axle rating but exceed my gvwr , and while people do it, it's still not correct, and does not ever reflect on the payload, the gvwr Trump's the grawr, always, that will never change when finding how much you can Haul. bottom line is you have to stay under your gvwr , if it's rated for 6900 pounds and you weigh 6500 pounds your "payload" is only 400 pounds, it matters not what your grawr is.
Even if you could find a truck with a payload listed, that payload is just weight added to a truck, so if you add heavier tires, you have to subtract it from the payload. Again, putting us back to the GVWR. I've even posted the articles directly from Ram stating this, in their own calculations they say this. For some reason people are under the assumption " payload " means weight added to the bed of a truck, payloads exist on honda civics, because it's a term used to associate something with hauling, which is what working people do with their work truck. That's why a payload is -always- an estimate unless you know the exact weight of your truck.