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Assume the rule of thumb that with driver and full fuel the weight is 450-lbs above factory shipping weight. Using a certified scale (three pads) works best. Wheel-by-wheel is recommended as this is a vehicle with cargo capacity (and a fairly substantial towing ability, beyond the factory rating) so that knowing FF and RR plus wheel-by-wheel under various conditions can be the aid in load versus pressure for tires.
The air-conditioned go-kart crowd doesn't quite understand that higher COG and widely varying loads means that tire "give" is integral to best braking and transient response with a van or truck.
Staying within the factory range of pressures, but dialling in the tires to maintain the 15% load reserve (see CapriRacers site) works very well on my pickup. To the tune of 120k on the first set of tires. Raising pressure doesn't always have a beneficial effect as it is more about the vehicle is being used, versus how the vehicle is being used. Keep that order, IMO.
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