Agree, the door sticker is not a good source for proper pressure for the load.
Anyone who is hauling heavy, or even just driving, any vehicle, owes it to themselves to get just a little bit educated about tire load ratings and pressures based on load, driving style, weather and comfort.
Those that can’t, won’t or don’t, is why the mfg puts the door sticker on that basically gives you most or all of your OE trie load capacity or expected load without consideration for any of the above conditions I mentioned.
OP, on your srw truck, unless you’re hauling a lightweight popup camper, anything around 3klbs or above begets max rest pressure in most all common sizes of truck tires.
That pressure is also woefully too high when it comes to driving with no load and even more so in rain or snow.
Bottom line, learn what “your” pressure should be, not the generics mfgs recommendation. Also learn the basics of the ideal gas law. That will help one understand how it’s normal for the pressures to vary with temperature.