What engine? With the front tire pressure recommendation, I'm assuming V8 gas.

You will get better fuel economy running higher pressure. The down side is rougher ride. Also, it is a heavier duty truck and will ride rougher than a 1/2 ton. The 285 e rated tires are also probably stiffer in the side wall that the typical light truck tire.

My truck rides smoother with a few hundred pounds in the bed or with a 5th wheel hooked up. It is just the nature of the heavier duty truck.