Eds,
The only correct way to get the answer to your question - relative to your truck - is too look up the tire pressure / weight chart from your tire manufacturer. Look at the specific load for each tire position and determine the correct pressure from the chart.
Personally I am at max of 12K lbs on the front axel and run 120psi in the front but only 85psi each in the 8-rear tires. I should also add that along with safety, PSI per tire affects ride quality a great deal. When we picked my coach up from the Tire Dude he had all 10 at 120psi and well...it rode like a truck. A few moments with BF Goodrich load charts and the world inside our coach was a much nicer place while underway.
Rad
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T2000 Complete (but never finished)
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