I found this tire pressure calculator that converts stock tire psi/ratings to a different tire/rating.
https://tiresize.com/pressure-calculator/
On my truck, stock tires are LT285/60R20 E 125; and new tires are 35x12.5 R18 F 128.
According to the calculator, the recommended F/R PSI of 65/80 converts to: 55 front/71 rear on the new tires, based on the different rating and load capacity.
I still need to do the chalk test, but perhaps a good starting point if you found a PSI you liked (or want to run recommended pressures) on stock tires.
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