My old '01 2500 Dodge/Cummins came with LT265/75-16 E. The silly tire placard said 50 psi in the front and 80 in the rears.
As I drove the new truck home (165 miles) I noticed the front tire plowed around corners. The back of the truck rode like a hay wagon. This truck had 4080 lb on the front axle and 2780 on the rear with no load.
I ran a chalk test on the fronts and found 65 psi worked best (2280 lb pin weight in the bed) along with no more plowing around corners.
No more weight than the 6.0 weighs IMO 70 lbs in the front may be a bit much. At 3350 lb front axle load = about 1700 lbs per tire. 60 psi sounds about right.
Agree with others on tire cupping issues.