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Old 04-29-2013, 09:25 PM   #1
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When to fill air bags?

Should I fill the suspension airbags before or after I hook up to my TT?
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Old 04-29-2013, 09:31 PM   #2
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Should I fill the suspension airbags before or after I hook up to my TT?
I usually fill mine after, but it really doesn't matter when. I usually measure fender cutout height before and pump to the same height after. After doing this a few times and noting the pressure immediately after unhooking, I will sometimes pump to that pressure prior to hook up, but usually just hook up with 10# so I don't have to jack the trailer up higher. Usually runs around 65# hooked up ready to tow.
I have an onboard compressor so it is easy to do.
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Old 04-29-2013, 09:46 PM   #3
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I asked the same thing on a F150 forum a few years ago when I installed my Ride-Rites and compressor kit. The Firestone rep that was member of the site said that it did not matter when you added air, it does the same thing either way.

Usually I will dump all the air in the bags when I back up to hook up to our TT, then once all lined up I air the bags up to the 30-40lbs I usually run in them for a usually weekend trip. Then lower the tongue just enough to latch the hitch, next tighten my WD hitch up, finally put the rest of the weight onto the truck and hook everything else up (lights, chains, break away).

I will say that having an on board air system is the way to go! A good friend that we camp with is now installing one in his truck after seeing how slick and easy it is to add and dump air from the bags.
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Old 04-29-2013, 09:49 PM   #4
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Should I fill the suspension airbags before or after I hook up to my TT?
If Tow vehicle load & Towed unit load are (Always) the same you can preload the same,otherwise pressure up after . Youroo!!
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Old 04-29-2013, 09:59 PM   #5
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Thanks for the info all!
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Old 04-29-2013, 10:10 PM   #6
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If Tow vehicle load & Towed unit load are (Always) the same you can preload the same,otherwise pressure up after . Youroo!!
Agree, but it takes less time to pump the bags up than jacking the trailer up, at least that's the way it is on our 5er. Bags are deflated anyway before hook up and I can pump them up on the fly.
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Old 04-29-2013, 10:27 PM   #7
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I have always filled mine before I hook up but don't know there is a correct or incorrect way to do it.
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Old 04-30-2013, 08:30 AM   #8
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There is no correct or incorrect way or time to do it. If you know the PSI you always ride with, you can do it before and you're set. If it changes somewhat depending on where you go, you can do it after. If you have the onboard (wireless remote for me) compressor, you can do it anytime you want...including on the road to adjust to changing conditions. Now that's a treat!
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