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I use the door placard range. Its higher than the Load & Pressure Table as those are dead minimums and test for pressure rise (CapriRacer, tire engineer who has posted here).
This is after weighing the vehicle on a segmented scale, and then all four corners.
First set of tires on this one ton lasted to 6/32's at 120,000-miles. At that adjusted minimum.
Safety trumps a couple of dollars. A tire inflated very much past what is needed is compromising the contact patch. Tune the suspension for better vehicle response, not the tire pressure.
Decreased tire life, suspension and steering component life plus various other ALONE should discourage this practice.
Tire quality, design, and correct tread for use are what matter.
And external heat measurement doesn't work. Another engineer who blogs on RV tire safety can take you through that problem.
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