I have some friends & fellow park volunteers who insist on running maximum psi in their E rated tires (80#) because that’s what is on the tire. While that assures that the tire will carry the load for which it is rated, all of the tires on their DRW truck are worn slick on the center of the tread. This indicates that the tread is crowning in the middle and the contact patch is greatly reduced. This causes much more problems than just tire wear. The reduced contact patch sets up a dangerous condition when driving on wet roads or snow, especially when the tread wears like this.Believe me, I've seen it...people have told me the ride is too rough when empty and they don't want to adjust the pressure every time they tow, so comfort wins out. I was told when I bought my first SD back in late 99 that I needed to run even the front tires at close to max due or I would have tires wear issues due to the weight of the Diesel. It might even have been here that I read that way back then.
On my previous truck, an SRW F-350, I ran 65 psi when solo & 80 psi (maximum for E rated tires) when towing the 5th wheel. With my present DRW F-350, I keep 75 psi in the front & 65 psi in the rear duals whether I’m towing or solo. This way I don’t have to air up or down & the tire wear looks good to me at 50,000 miles. I have carefully checked the tire temperatures with an infrared thermometer while towing &the rear tires look normal, not at all low.
I’m certainly not saying that this is what everyone should do. I’m just saying that it works well for me.