Your maximum GVWR is on a sticker on the door jamb. I think it should be 9,900 lbs or so for a single rear wheel F350 but I am not sure.
Subtract the weight of your truck full of fuel and folks and that is the payload when you have all the folks in it. Your truck specs will have a lot to do with it. Standard cab, extended cab, crew cab, 2-wheel or 4-wheel drive, auto or manual transmission, all this stuff adds weight.
Payload on my 1995 F250 extended cab 2-wheel drive is 2,220 lbs with me in it and nobody else. My GVWR is 8800 lbs. I figured this by weighing the truck on a commercial scale when I weighed my horse trailer.
That said, if you are not going very far and drive in a sane manner you should be good with a couple tons to a couple and a half, I haul shredded topsoil and gravel in mine once in a while and usually put 4-5,000 lbs in the bed.
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