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This is excellent advice. What we think is a good pressure isn’t always correct. When I replaced my tires I went with one size larger at 275/65R20 and they are an E load LT tire. The installer set them at 50 psi which was teeth rattling. I dropped them down to 45 psi and was content till I saw a YT video on the chalk test. After experimenting with the chalk I found 41psi was the number I was looking for and the tires are wearing very well three years later with proper inflation and rotations every 10k.Do the tire chalk test (search that on youtube).
I did with my truck & found the rear tires like 36 psi with no load in the bed. The fronts are good @39 since it has the engine weight on them
The way I usually do it is to air up when I'm done for the night and staying home with no more driving. I'll over inflate 5# or so, and then in the morning before the sun starts hitting the tires as that will also skew things a bit, I use my accurate tire pressure gauge and air down to hit my 39psi, cold.ADDED: FTR, not wanna call ne body in here not knowledgeable. But @CanuckRam1313 said, air up when tires completely cold,. Even a couple of mile ride to town will throw off yer psi by a few pounds. Just general info, hee hee.
I just go out in the am, start the beast up, and drive down to garage. Get my air compressor going, get out digital gauge and set to desired PSI.The way I usually do it is to air up when I'm done for the night and staying home with no more driving. I'll over inflate 5# or so, and then in the morning before the sun starts hitting the tires as that will also skew things a bit, I use my accurate tire pressure gauge and air down to hit my 39psi.
I do this every three to four weeks as it's just my thing and have always done this throughout my driving career.
My 6yo daughter and I now do it together and enjoy our time together. She asks many questions and gets right in there with her little hands all dirty... I'm a proud Dad!