I never go by the sticker in my truck, if I did I'd have 32lbs in my tires that have a max of 50psi. I always use the max pressure on the sidewall at all times. Right or wrong its never failed me and my tires always wear even.
I have the Continental LT275/70R18 that have a max PSI of 80. I ran them at 75PSI my last tow and that worked well. The door sticker calls for 65PSI for everyday use and thats what I keep them out for non-towing.