For A truck you can use my motorhome spreadsheet too.
And because the tires chanche the pressure advices on truck are not valid anymore.
If you then look up the assumed loads in a list of the tires, those lists that can be found in America are giving to high loadcapacity for the pressure.
If you see different loadkinds ( C to H load) in one list you can sertainly say they are wrong. This is not done in Europe and also formula is used that leads to lower loadcapacity for the pressure, so saver.
For P-tires and XL/Extraload/reinforced American TRA swiched over to the European ETRTO formula as late as 2005.
So I dare to write that you can better use my motorhome/smalltruck calculator then looking in American lists, wich still uses for C-load and up formula that leads to to much deflection in the lower load/pressures.