Depends on what truck and tires you have and payload. You can follow the manufacture's recommendation on the door sticker. You can also weigh your truck and inflate them to a safe margin above the minimum for the loaded truck weight. In my case, my stock General Tire Radial Grabber HTS LT245/75R-17E tires are inflated to 65 psi in the front and 80 psi (max cold tire pressure) when towing my fifth wheel trailer due to the added payload.
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2022 Jayco Pinnacle 36SSWS / 2016 Ford F350 6.7L Diesel Crew Cab LB DRW 4x2
2022 Thor Palazzo 33.6 diesel pusher / 2021 Chevy Equinox LT AWD toad
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