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As said if leveling then whatever it requires with the airbags. I adjust mine for ride, and have the onboard compressor, so if you have the onboard, and want to adjust just for ride then no big deal, I start with 35 lbs, and if I want to adjust on the fly I do.
Tires , I run max on front ,and rear when hooked up, for me thats 60 front ,and 80 back, thats what is on the door sticker . but that dually will be different.
When empty , I air down to 50 in the rear , and leave the front alone to improve the ride .
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