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Following the door plate suggestion is one of the things that got Ford in trouble with the Explorers and the rollovers that happened several years ago. My past experience in tire sales and installation lead me to follow a mental sidewall pressure template. Too low a pressure is never good on the sidewalls of the tire.
Tire sidewall max rating............................................ ....Preferred psi setting
35 32
38 35
41 38
44 41
50 45
65 55
80 70
(80 psi tires commonly found on 6wheelers or duallys here in the US often have the steers set down around 65 and rears at max of 80 and many of the drivers of such kept to that, but to keep the balance in the treadwear, I would suggest the steers to come up a bit)
110 100
Having said all that, I know some folks like to run even higher pressure in the hopes of easing the frictional component by trying to reduce the surface contact patch of the tire. Better off getting an actual slimmer tire or finding the actual LRR type to replace it with.
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