keep in mind the numbers in your door are for max load and will result in less than ideal handling and ride.
If you have good weights...corner weights are best to work with, but axle weights will do, then adjust the pressure through the wheel and rim association's (something like that) pressure/load charts for your specific size...available through some tire manufacturers.... Michelin's is readily found online. I've been told that the numbers are standard and will apply to any tire make....for that same size
I think yours is an E-450 chassis like mine, right? Based on my tires and loading, I run 80 psi rear and 70 psi steer. Gives me a much better ride than 80 all around
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