Drop the pressure in the rear tires to 35-40 psi and the fronts to 45-50psi. Front psi will not make as much difference as rear. You may even be able to go lower depending on the width of the tires.
That will make the most improvement of anything shy of ditching the leaf springs for an expensive air ride.
If the tpms light bothers you figure out how to have the threshold re programmed. I've done it on Rams and Fords but not on GMs.
This is an easy free solution that takes 5 min and you can test it out. Do it before you drive home from work and see what you think.
Having the psi thresholds so high on the newer trucks is just ******** and the NTSB saving us from ourselves. There are many instances where it is wrong or even unsafe to run that high of psi in an empty pickup.
