Guessing you are 2WD? My suggestion is 80 if 4wd and use the inflation chart and add 10psi for the fonts if 2wd. I HIGHLY advise getting the front end toe set to 1/64" or you WILL have outer edge stepping. Then leave rears where they are and only rotate fronts side to side leaving the rotation the same. This requires removing the tires from the wheels and have the outsides become the insides.
Rears use the inflation chart and add 5psi. Unloaded run 30-35.
I have a lot of experience with all the above. Best ride and tire life.