I've had this conversation with others before. I had some LR E tires on my half ton, I would run them at 35 PSI when not loaded. I was told I couldn't do that, they aren't rated, etc... by so called, "experts."
So I showed them this.
http://www.michelintruck.com/referen...tion-tables/#/
Anyhow, most LR E tires can be safely run at 35 PSI without any ill effects. Trust me, your back and kidneys will thank you.
I don't know what kind of tire you have, but I'm sure the manufacturer has a similar inflation table.