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Use a certified scale, here, to determine truck weight. Dodge guidelines are pretty well right on the money in regards the Michelin Load & Pressure Table. Best LT tire life, best braking, best handling are a result of matching pressure to load. Screwing around with what works is a lousy idea.
On a cars P-radials I may start with 75% of sidewall max to see how it is; and then adjust FF/RR according to factory-recommended pressure bias. Generally I wind up within only a few pounds the door sticker numbers and default to them (when tire size is non-stock).
Overly stiff tires simply damage the vehicle long-term as the tire does have a function of shock absorbtion and side-to-side roll resistance. Any so-called mpg gain doesn't offset shorter component life and reduced performance. Safety trumps all.
On my truck I'm on track to get 250,000 miles out of the first two sets of tires via this method -- plus easy driving -- on MICHELIN LTX A/S.
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