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My 2008 6.4L E350 dually (17" A/S Contis) sticker says 75# front, 60# rear for 13K GVW. Should I vary those at all with my truck camper on or off? It weighs 5K.
Let out some pressure when empty, but be careful and take notes. I find when I take 15 pounds of pressure out of my tires I can induce a steering wheel oscillation after hitting a bump
Every truck is different. You just need to experiment a little to see what works best for you.
The tire makers all have charts for each size of tire where they publish weights vs tire pressure - I have seen links to these on websites. Weigh your truck exles empty and loaded and determine the weight per tire. That is the correct pressure. The truck in my signature runs 55 psi front and 35 psi rear empty and 60 psi front and 45 psi rear when I pull.
What i do is to take some clean white paper in my driveway (after i sweep it), and place in front of tires and roll forward. look at the contact patch. If the tread pattern does not go to the shoulder = too much air. If you see the shoulder and a little sidewall break over = not enough air. This will work both loaded and empty. If doing this loaded, and at max tire pressure you see shoulder + some breakover, your too heavy for the capacity of the tires.
Also, Check when loaded and at optimal tire pressure to see if the tires are rubbing together at the bulge. This will cuase heat build up in the sidewall and cause a failure after a while.
My tire pressures are written on the tire for single and dual use
The pressures on the tire are for maximum load single and maximum load dual. When running these pressures not loaded you are compromising ride quality and tire wear because the over inflated tire will wear more in the center. The process talked about by the poster above with the footprint being monitored across the tire face will confirm what I am talking about.
Another version of the white paper test is the chalk test. Just draw a chalk line across the tires, then drive a short distance and note where the chalk has not worn off, which indicates the area not making road contact.
Another version of the white paper test is the chalk test. Just draw a chalk line across the tires, then drive a short distance and note where the chalk has not worn off, which indicates the area not making road contact.
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