If you have changed tires the pressures may have changed. You really would need to go over truck scales and get the weight of your rig for front and rear, and then one side.
From that you can look at the tire literature, which will say for xxx lbs in a dual position you need xxx psi, and so forth.
Its best to do this with the rig as loaded as it can (all tanks full, toad attached, etc). If not, you can add some weight on to what the scales says.
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