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Old 02-22-2013, 01:43 PM   #1
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Air Bag Air Pressure

This is a dumb question but I've been pondering this for a while and I can't find a direct answer anywhere. For those of you hauling with air bags, at what point do you air them up when towing? Before you add the TT/5th or after?

My bags can carry 50lbs per PSI. With a 2,000lb pin weight that would equate to 40 PSI in the bags. If I air up to 40 PSI before I hookup ( in my mind) that will increase the pressure in the bags to beyond 40 PSI? My point being I don't want to under inflate the bags based on their weight rating but don't want to over inflate and remove too much pin weight from the truck and potentially over load the trailer tires/axles. Make sense? Should I load up the 5th and then air up bags to 40 PSI?

Am I over thinking this!
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Old 02-22-2013, 02:14 PM   #2
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Originally Posted by Tblackmon9599 View Post
This is a dumb question but I've been pondering this for a while and I can't find a direct answer anywhere. For those of you hauling with air bags, at what point do you air them up when towing? Before you add the TT/5th or after?

My bags can carry 50lbs per PSI. With a 2,000lb pin weight that would equate to 40 PSI in the bags. If I air up to 40 PSI before I hookup ( in my mind) that will increase the pressure in the bags to beyond 40 PSI? My point being I don't want to under inflate the bags based on their weight rating but don't want to over inflate and remove too much pin weight from the truck and potentially over load the trailer tires/axles. Make sense? Should I load up the 5th and then air up bags to 40 PSI?

Am I over thinking this!
I usually put about 10-15 lbs. of air in them before dropping the pin onto the hitch (fifth wheel). Then once the landing gear are up, inflate the rest of the way. Usually run about 40 PSI in the air bags and adjust on the fly if necessary.
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Old 02-22-2013, 02:18 PM   #3
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Thanks. That's kind of what I was thinking. I aired up to 40PSI before loading last trip and it made the ride much worse.

How's the weather up your way today?
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Old 02-22-2013, 02:26 PM   #4
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Thanks. That's kind of what I was thinking. I aired up to 40PSI before loading last trip and it made the ride much worse.

How's the weather up your way today?
Did the same thing when I first got my air bags. It took a few trips to get everything adjusted to my liking. I added the onboard compressor with in cab controls and it made my life a breeze.

Have been in St.Louis most of the week, snow and rain all yesterday but clearing up today. Roads are fine. I think everyone was prepared for the most part.
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Old 02-22-2013, 02:29 PM   #5
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I just installed my on board compressor and I think that will help tremendously going forward. Glad you escaped the "blizzard".
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Old 02-22-2013, 05:44 PM   #6
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I usually hook up to my truck with the 5psi in the bags as "empty". Then I go up to 35psi for my application. I have the remote wireless so I can change it on the fly, which is awesome. I will say that the amount of air is dependent on the conditions. Conditions of the road, the weight of the kingpin, and other factors. So you have to figure out what works right for you.
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Old 02-22-2013, 05:57 PM   #7
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I usually hook up to my truck with the 5psi in the bags as "empty". Then I go up to 35psi for my application. I have the remote wireless so I can change it on the fly, which is awesome. I will say that the amount of air is dependent on the conditions. Conditions of the road, the weight of the kingpin, and other factors. So you have to figure out what works right for you.
Thanks for the input.

I installed the bags a while back and could only air up before I left home and the campground. I noticed that the nose of the 5er looked kind of high the last time I pulled it and the ride was terrible. That's when I really started asking myself if I should air up before of after. I believe I must have transferred too much weight to the 5er and that's what caused the ride to be so bad. I just installed an on-board compressor myself and I think that will help me dial it in as I pull it. You guys have both helped me with your responses and it's greatly appreciated. This forum has really helped answer a lot of questions for me as I'm still kind of new to camping. That's again.
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Old 02-22-2013, 06:52 PM   #8
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You will love the onboard air system! I believe it is the best mod you can do to a TV(in conjunction with bags). I run around 12 PSI in my bags when empty. When loaded, it goes up to around 34 PSI. I love being able to adjust on the fly. When the interstates get bumpy, I usually go up to around 40-45 psi to help with the bouncing of the roadway. Here is a pic of my Viair system installed.
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Old 02-22-2013, 09:03 PM   #9
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I have just received my TLC Airlift kit with the wireless today. I hope the weather breaks so I can get them installed. The forum has been a great source of info. Here yet again is some ore great stuff. They say it should only take about 1 hour to install. I might just have to brave the cold and dress up for the weather and get her done.
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Old 02-22-2013, 09:15 PM   #10
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Git R Dun Dude!!!!

You'll love the control. I thought about wireless but.....

One suggestion, don't know if you are installing air lines but if so and you want to insulate them with conduit make sure you do it before or as you go. It's a real pain otherwise.
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