Newbie here.....

2004-1/2 3500 with all the good stuff but confused about what pressure to run the tires at. The sticker on the door says to run the fronts at 55 psi and the backs at 65 psi. The tires say the maximum pressure is 80 up front and 90 out back. Seems to me that the tire sidewall rating is closer to what the tires should be running at but need a bit of input from all the wise ones......

 

Run at sidewall spec. if you load your truck down. If you use it for daily driving, the tires will not wear evenly at sidewall spec. I run mine at about 70 psi for daily driving and air up to sidewall (95 psi) when towing or hauling. If you leave it at sidewall for daily driving, the tire tread will wear much quicker in the center of the tread

 

I agree with Jake.
I run mine at 50 # all the way around and inflate the rears to max when hauling or towing.
When I first got the truck, they had 30# all the way around and I put them at max press.
Truck rode stiff so I dropped to 50#.

 

Remember to check your tire pressure when tires are COLD! Air expands when heated and will give you a false reading. Better yet if available in your area repalce the air with nitorgen, nitrogen will not heat up like air. Cooler running tires mean longer tread life and better fuel economy.