Air pressure jumping in front tires
I have a Freightliner Tag with 22.5 tires. I set rear tires at 85-88lbs and fronts at 117lbs. After driving rears jump up to 98-105. The fronts will hit 143-147. The fronts are within 1-3 lbs of ea...
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Another thought is that you adjust the tag axle to remove some weight from the front axle. I adjust mine so that the drive tires run at 95 psig and the front at 105 psig. Those pressures are 5 psig above what was calculated by axle wt. The fact that you need 117 in the front and only 85 in the rear suggests you have a lot of wiggle room in moving some weight rearward.
