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Don't know about the firestone's, but with the airlift 5000's you can run without any air, although they recommend 5lbs when empty. I run 7 or 8 in mine, just to cover any leakage between trips, and don't feel any difference.
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2015 3100RL legacy...2005 Ford F-250 CC SB. Tows like a charm! 4/19 Updated to 2017 Chevy 3500 CC SB SRW -hope it tows as well as my F 250 did!
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