Air ride pin box question

[Mmaxed]

In some pictures it looks like the king pin part of the pin box is pointed down. Is it hard to get hooked up with these systems?

[JKJavelin]

Cummins12V98 wrote:
You need to air it up to 100psi overnight then do your adjustment after hitching. Give it a try, worked for me.

That's interesting, and I'll try to remember that, although before hitching I air mine up to about 70 lbs, then after hitching up I drop the pressure until the shock is just above mid stroke, usually around 65 lbs. I almost never have to add more pressure during a trip, even when it's a couple of months.
Good to know.

[Cummins12V98]

You are welcome!!!

Another Happy Ending on RV.NET :B

[CoMoCo]

It's been awhile but we were on the road.

On Thursday, August 17 I aired the pin box up to 98 psi - that's all my compressor would give me! On Tuesday August 22 I went to the storage yard to go on our trip and lowered to 68 psi. We were gone for 4 weeks and the pin box held this pressure except once mid trip - it was down to 64 psi and I topped it back up to 68 psi.

I checked the pressure every couple of days (before we were leaving from a stop) and I was pleasantly surprised that it held the pressure so well. It seems to have worked!


Thanks Cummins!

[CoMoCo]

I will give it a try before our next trip. Thanks for the tip!

[Cummins12V98]

You need to air it up to 100psi overnight then do your adjustment after hitching. Give it a try, worked for me.

[CoMoCo]

Cummins12V98 wrote:

Bionic Man wrote:
Why would the amount of psi effect the air bleeding out?

On my previous DRV I had the same pinbox. I was told on a DRV forum that TrailAir said to pump to 100psi and it should seal whatever was allowing the pressure to drop. I did the suggested and it did worked.

Interesting. So you are suggesting fill it to 100 psi and then drop to a lower pressure and it should hold the lower pressure? (The lower pressure being the one where the arrows line up on the shock absorper.)

[Bionic_Man]

Interesting. I haven’t had the same luck. I’m ready to replace the Schrader valve to see if that helps.

[Cummins12V98]

On my previous DRV I had the same pinbox. I was told on a DRV forum that TrailAir said to pump to 100psi and it should seal whatever was allowing the pressure to drop. I did the suggested and it did worked.

[Bionic_Man]

Why would the amount of psi effect the air bleeding out?

[Cummins12V98]

Fill it to 100psi and let it set.

Fill bag so arrow tips are aligned with designated point. That's it as it does not matter if it is at an angle or not. Won't hurt to lower the pressure from there is you want.

[Cummins12V98]

Bemota wrote:
If you have the recommended pressure or too much air for your trailer wt it is reeeeel easy to high-hitch and when you tug you can not tell cause the jaws are closed, dropped mine once going to sell it get a decent pin box Dan

Let me guess your hitch has 1/2" thick jaws.

[jaycocamprs]

Cummins12V98 wrote:

CoMoCo wrote:
Mmaxed - I have one of these Trailairs on my 2022 Cedar Creek and shared the same concern about the angle of the lower jaw. I have no problems hitching and unhitching.

There are 2 things I don't like about the Trailair - it looses air pressure and forces me to carry a compressor to ensure it is filled with air. And I don't like how it sits on my Curt Q24 hitch - this hitch is articulating and the head does not sit level when hitched up - it tilts slightly downward, towards the front of the truck.

Lippert says both of these things are normal, I disagree. I have had the airbag in the Trailair replaced once under warranty due to leakage and the replacement is just as bad. Maybe my dealer is the culprit and didn't install it correctly. I am working with my dealer to get the current air bag replaced.

Have you applied 100psi to the bag? That can help with air loss. The CURT design is the issue not the TrailAire. The heads pivot point being several inches below the kingpin connection is. This can lead to chucking, a common complaint against the CURT. B&W pivot point is right at the level of the kingpin.

No it's the TraiAir, Head points down on mine, even with a B&W. The Curt may lead to chucking, but the pin plate of the TrailAir does not sit level.
Air bag leaking, yea that's normal Lippert quality.

[CoMoCo]

Cummins12V98 wrote:

CoMoCo wrote:
Mmaxed - I have one of these Trailairs on my 2022 Cedar Creek and shared the same concern about the angle of the lower jaw. I have no problems hitching and unhitching.

There are 2 things I don't like about the Trailair - it looses air pressure and forces me to carry a compressor to ensure it is filled with air. And I don't like how it sits on my Curt Q24 hitch - this hitch is articulating and the head does not sit level when hitched up - it tilts slightly downward, towards the front of the truck.

Lippert says both of these things are normal, I disagree. I have had the airbag in the Trailair replaced once under warranty due to leakage and the replacement is just as bad. Maybe my dealer is the culprit and didn't install it correctly. I am working with my dealer to get the current air bag replaced.

Have you applied 100psi to the bag? That can help with air loss. The CURT design is the issue not the TrailAire. The heads pivot point being several inches below the kingpin connection is. This can lead to chucking, a common complaint against the CURT. B&W pivot point is right at the level of the kingpin.

I have the recommended pressure based on lining up to the mark on the shock of the Trailair which is around 75 psi. Maybe I will try more air to see if that stops air loss. Interesting about the height of the pivot point - wasn't aware that would be the issue. I don't have chucking though. Thanks!

[Bemota]

If you have the recommended pressure or too much air for your trailer wt it is reeeeel easy to high-hitch and when you tug you can not tell cause the jaws are closed, dropped mine once going to sell it get a decent pin box Dan