I can’t help but think of two things in this discussion: “a little bit of knowledge is a dangerous thing” and “lies, damn lies, and statistics.”
There are two documents here from the same manufacturer (Toyo) that appear to say different things, and each of us is potentially cherry picking which one to believe.
The weight a tire can support is only one of the factors that goes into an OEM decision tree when picking a tire and recommended inflation, otherwise all the tires would be the same. Handling, stopping, ride, etc. my F-350 actually has a range of recommendations based on gross weight.
The first document shows how much inflation you need to support a given weight. Our trucks all need to support less than 2000 lbs per tire, and Toyo says you can do that with 30psi in all tire sizes.
The second Toyo document would seem to contradict the first, but only if you assume the only reason Toyota recommended tire pressures based solely on weight capacity, and ignore all other factors. The reality is the tire pressures Toyota call out allow those tires to carry far more weight than the truck is designed for (~9000+lb?). So I’m assuming Toyota pressure specs were based on other factors I don’t know.
I do know from my personal testing, over 150k miles, that lower pressures (33psi) have had no adverse impact on wear or fuel mileage, but sure improve the ride. Take that for what it’s worth and do what you think is right, but be careful casting stones when others choose differently.