I run 15 to 20 pounds in mine unloaded so when I hit a bump I don't damage a bag by bottoming it out. 5 pounds is not enough air as some have stated here run. I run about 60 hooked up which levels the truck and trailer. I have the hitch set at the lowest setting and i could lower the trailer another hole if I needed to. I have plenty of bed clearance with my set up like it is.
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