Take it across a scale to weigh it axle-by-axle. DODGE has guidelines which work for loads within limits, and a Tire Manufacturer Load & Pressure Table will give the correct pressure number across the full range.
In this instance, a "generic" 3,042-lb LR-E table will get you close. Contact your tire manufacturer for specific pressures against loads.
Best tire life and tire performance is via correct numbers against a scale reading.
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