I always use what gives my particular truck/car the best ride and the longest tire service. Works much better for my 2500 Dodge/Cummins than the silly door post placard that says 50 psi under the Cummins and 80 psi rear.
This truck has the LT265/70-17 E tires. I keep a front and rear axle scale ticket in all of my vehicle glove box. When empty this truck works best with 45 psi in the rear (1420 lb load per tire) and 65 psi under the Cummins (2120 lb load per tire).
Of course I air up when towing or hauling different loads. I ran the OEM Michelin LTX AS for over 112k miles using those numbers.