Those payload stickers are a gvwr based payload that comes from weighing the trucks front and rear axle. In many cases its unsafe to use that number to figure how much load in the bed such as hitch weight, or a truck camper, a truck can carry.
Ford advertises a 3000+lb lb payload for a F150HDPP. Add much over 2500 lbs in the bed and the rawr is overloaded.
Same with some 3/4 ton trucks with 6000-6500 rawr. About 3200-3300 lbs in the bed is about all these trucks can carry.
One ton SRW trucks have 7000-7200 rawr and most can carry around 3600-3800 lbs (some are heavier) in the bed.
Now anyone that has been to the 4th grade can see those payload stickers are not safe for all LDTs.
Stay under the truck rawr (tire/wheel/rear suspension) number for a safe tow.
Those LDTs we see every day on our roads pulling some type of trailer making a living don't use the trucks gvwr based payload sticker numbers. Guess all 3.5 million of them some how are unsafe :R.