Good Sam Club Open Roads Forum: Fifth-Wheels: Air Bag Pressure
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Cummins12V98

on the road

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Posted: 02/13/21 10:07am Link  |  Quote  |  Print  |  Notify Moderator

Crespro wrote:

Hi,

For those of you with air bags on the rear axle and a fifth wheel, how much pressure do you use?

I started with 30 PSI and now increased to 38 PSI. About 2,750# of pin weight.

Crespro


Bottom line add enough air to keep truck setting level to slightly rear high. This keeps you ON the overloads.

My 2011 DRW RAM I ran 30psi LOADED with 4,500# pin weight. The ride was AWESOME!!!


2015 RAM LongHorn 3500 Dually CrewCab 4X4 CUMMINS/AISIN RearAir 385HP/865TQ 4:10's
37,800# GCVWR "Towing Beast"

"HeavyWeight" B&W RVK3600

2016 MobileSuites 39TKSB3 highly "Elited" In the stable

2007.5 Mobile Suites 36 SB3 29,000# Combined SOLD

TXiceman

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Posted: 02/13/21 10:23am Link  |  Quote  |  Print  |  Notify Moderator

garyp4951 wrote:

I run 20psi just to help the coil springs on the dips at bridges.

TXiceman, my air bags say I can carry 5,000 lbs more. LOL



The air springs DO NOT increase the load capacity of the truck.
All you can say is the air springs an carry 5000#.
The truck is rated for what is stamped on the stickers inside the door jamb.

Ken


Amateur Radio Operator.
2013 HitchHiker 38RLRSB Champagne, toted with a 2012, F350, 6.7L PSD, Crewcab, dually. 3.73 axle, Full Time RVer.
Travel with a standard schnauzer and a Timneh African Gray parrot

JRscooby

Indepmo

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Posted: 02/13/21 11:06am Link  |  Quote  |  Print  |  Notify Moderator

TXiceman wrote:

garyp4951 wrote:

I run 20psi just to help the coil springs on the dips at bridges.

TXiceman, my air bags say I can carry 5,000 lbs more. LOL



The air springs DO NOT increase the load capacity of the truck.
All you can say is the air springs an carry 5000#.
The truck is rated for what is stamped on the stickers inside the door jamb.

Ken


But all that means is if the manufacturer can prove you went over their rating they don't pay warranty claims. The only rating the law will enforce is the tires.

Durb

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Posted: 02/13/21 11:26am Link  |  Quote  |  Print  |  Notify Moderator

15 PSI, 2,000# on the pin, 41 gallon auxiliary tank and 300#+ hitch. I need some truck squat to get everything level.

Cummins12V98

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Posted: 02/13/21 12:04pm Link  |  Quote  |  Print  |  Notify Moderator

TXiceman wrote:

garyp4951 wrote:

I run 20psi just to help the coil springs on the dips at bridges.

TXiceman, my air bags say I can carry 5,000 lbs more. LOL



The air springs DO NOT increase the load capacity of the truck.
All you can say is the air springs an carry 5000#.
The truck is rated for what is stamped on the stickers inside the door jamb.

Ken


On paper no but reality is YES. Simply look at the weak springs and tell me bags don't add capacity. Axle is rated at 9,750#.

[image]

Cummins12V98

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Posted: 02/13/21 12:07pm Link  |  Quote  |  Print  |  Notify Moderator

Durb wrote:

15 PSI, 2,000# on the pin, 41 gallon auxiliary tank and 300#+ hitch. I need some truck squat to get everything level.


Level is good! I see too many people running down the highway with their rear at or higher than their unloaded ride height and front of 5er way nose high because of overinflated air bags. Then they wonder why they have chucking and a poor ride.

fj12ryder

Platte City, MO

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Posted: 02/13/21 01:38pm Link  |  Quote  |  Print  |  Notify Moderator

Super_Dave wrote:

fj12ryder wrote:

Around 50-55 psi gets the rear off the overloads on mine.

I want mine on the overloads for stability and I pressure for level and nothing else, about 10 - 15 psi when unloaded works best for me. I haven't measured what it is when loaded.
The ride is horribly harsh when the truck is on the overloads, and by a happy coincidence, the truck is level when it comes off the overloads. Win, win. [emoticon]


Howard and Peggy

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Lightning55

Pleasanton, CA

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Posted: 02/13/21 10:49pm Link  |  Quote  |  Print  |  Notify Moderator

It takes 60 psi unless I'm loaded heavy, then it takes 80 to level off the rig

JRscooby

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Posted: 02/14/21 06:39am Link  |  Quote  |  Print  |  Notify Moderator

Some think that sticker on the door jam is a commandment from god, or at least a gov mandate. I once bought a few tractors that had a GVWR of 32,000 or less, (don't remember for sure, know it was 12 steer, 20 on single drive), and a GCVWR of 80,000. I did a lot of changing to make them do what I needed to do. Basically I used the engines and cabs. About a week after I put them to work driver got stopped for torn mudflap. LEO, matching VIN to paperwork saw that 80, looked at BOL, that showed GCVW of 110,000. Now normally my drivers would pay 30% of fine, but I needed them moving rock, so I told them it was all on me. By the time I went to court on the first one I had over 40 tickets in hand. Cost me a little with the lawyer, but the judge explained to that officer that the only number on that plate that was any of his business was the VIN
Now I was dealing with CMVs. But most LEOs are more likely to be strict with CMV, but not look at RVs
Now I'm not saying running over your ratings is a good idea, because it will cause handling issues, and wear parts faster.

* This post was edited 02/14/21 10:03am by an administrator/moderator *

FlatBroke

CO/AZ

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Posted: 02/14/21 07:01am Link  |  Quote  |  Print  |  Notify Moderator

I leave mine at the minimal when riding around empty, when I hook up it goes to 30, I just leave it there. Haven’t touched the buttons in years.



Hitch Hiker
"08" 29.5 FKTG LS


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