Are you talking about your 5er tires or your truck tires?
Some ST tire makers allow 10 psi over the sidewall recommendation for some of their tires. Carlisle I think is the one I most recently read on line. They claim the extra PSI allow the tires to go 10 mph over the 65 mph speed recommendation.
I keep all of my vehicle tires at 5-10 psi over the sidewall and/or door plate recommendation. I have had better tread wear doing that. I also rotate my tires at 10,000 mile oil changes and the trailers (3 of them) each year.
Changes in speed, air temp. and elevation will change the tire pressure more than the 5-10 psi so I would not worry about increasing the pressure 5 psi.
However, it is about time to change the tires if it is on your 5er. Add the 5 psi and see if the new tires wear any better.