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I am a big believer on running the OEM recommended pressures
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Don't inflate to the max (on tire) unless you're loading down the car/truck.
Ideally, you would weigh all 4-corners with individual scales. That gives you a "pounds" value on each tire. Then, calculate the contact-patch of the tire, that gives you an "area." Divide the pounds by the area (pounds per square inch) and that
should give you the perfect balance of tire pressure.
But having big wide tires may end up distributing that weight over too much area, giving you this value in the 15-20 psi range. Good for the tire, but not as safe for the road. That's why having the correct size tires is critical.
Basically, more load on the tire or a narrower tire, means more psi it will require for proper load-carrying capacity (look at the 65psi rating on the tiny spares).