What PSI should my tires be at? Should they be the same in the front and rear or higher psi in the front?

I have a 2015 Ford F-250 crew cab, short bed, 4x4 6.7ltr diesel and I don't haul anything ever. My tires say 35 x 12.5R 20LT Load E and the outside of the tire reads 65 max psi. But I know you're not suppose to fill them to that. Can anyone help me out.

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