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I had firestone air bags on my 2000 F250 Super Duty diesel with a 40" Weekend Warrior toy hauler. Never leaked in 20 years. Mine were air ports in the rear bumper. Onboard air control is a much better option. My truck was also very overloaded. It did ride more level with the air bags. When not towing, I dropped them to 3- 5 psi, the truck rode like stock. If I forgot to decrease the pressure and hit a bump, you really knew it.
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