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dodge guy

Bartlett IL

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

Grit dog wrote:

Durb wrote:

If you can, disable the auto air bags and use the WDH to level your vehicle. If your auto level lifts the rear of the truck after your hitch has been set up it will serve to unload your front tires and possibly defeat the anti-sway capabilities of your hitch. Both scenarios make your tow worse and possibly unsafe.


Doesn't work that way. Can't just turn it off on a Tahoe.

It's not much different setting up an an auto level system with weight distribution, just cant use a tape measure. Either scale or trial and error until it "feels" right. The ride height will just remain the same.

It needs to be disabled somehow (pull fuse) until you get the hitch setup. Then you can reneable the system.


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murphsfromaz

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Posted: 04/14/21 07:58am Link  |  Quote  |  Print  |  Notify Moderator

dodge guy wrote:

Grit dog wrote:

Durb wrote:

If you can, disable the auto air bags and use the WDH to level your vehicle. If your auto level lifts the rear of the truck after your hitch has been set up it will serve to unload your front tires and possibly defeat the anti-sway capabilities of your hitch. Both scenarios make your tow worse and possibly unsafe.


Doesn't work that way. Can't just turn it off on a Tahoe.

It's not much different setting up an an auto level system with weight distribution, just cant use a tape measure. Either scale or trial and error until it "feels" right. The ride height will just remain the same.

It needs to be disabled somehow (pull fuse) until you get the hitch setup. Then you can reneable the system.


It can. Go into the system on screen. Then suspension, then click service mode. Be level first. Once you hook up the trailers electrical it will go back to normal. Disable your comfort setting for lowering when placed in park. This is how my 2021 Yukon XL Denali is set up.


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RenkenHouseOnWheels

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Posted: 04/14/21 09:13am Link  |  Quote  |  Print  |  Notify Moderator

Thanks everyone for the information. I think I will just need to play with it a little bit more using both the Weight distribution hitch and auto levelers since I am unable to turn them off.

Grit dog

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Posted: 04/14/21 09:30am Link  |  Quote  |  Print  |  Notify Moderator

Murphs, it’s not the same.
Checked owners manual for the ‘17 and it actually only talks about the old school way just like the 2021 manual but the 2021 calls for putting in service mode and adjusting the wdh then letting the bags pump up again.

This is NOT fundamentally the right way. Wdh works on load. Auto air leveling Suspension is exactly what it states. It works only on ride height with height sensors.

If you drop the air, let the trailer squish the rear suspension, do the measure the front height thing, when you’re done, the trailer WITH weight being pulled off the rear axle is still compressing the rear springs loading the ride height some amount.
When you air back up, the auto ride takes over, pumps up the rear suspension and by way of doing that, changes the geometry of the wdh connection. Effectively putting “more” load on the bars. Opposite reaction of adjusting the trailer jack height to make attaching the bars easier.
Except now you’ve changed the load the bars are seeing and how much weight it’s transferring.
Think about it from a purely geometric and statics standpoint.
You want the auto ride height where it is leveling the vehicle when you setup the weight dist. because it will always compensate for load and maintain the same geometry.

Those that don’t understand these systems and how wdhs affect the forces on the vehicle and how these 2 systems need to consider how each other works and how that is different than just a simple spring suspension.
The nuances may not be great with a lighter tongue weight, but the heavier the tongue weight, the more important this becomes.


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Terryallan

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Posted: 04/16/21 04:46pm Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:

Murphs, it’s not the same.
Checked owners manual for the ‘17 and it actually only talks about the old school way just like the 2021 manual but the 2021 calls for putting in service mode and adjusting the wdh then letting the bags pump up again.

This is NOT fundamentally the right way. Wdh works on load. Auto air leveling Suspension is exactly what it states. It works only on ride height with height sensors.

If you drop the air, let the trailer squish the rear suspension, do the measure the front height thing, when you’re done, the trailer WITH weight being pulled off the rear axle is still compressing the rear springs loading the ride height some amount.
When you air back up, the auto ride takes over, pumps up the rear suspension and by way of doing that, changes the geometry of the wdh connection. Effectively putting “more” load on the bars. Opposite reaction of adjusting the trailer jack height to make attaching the bars easier.
Except now you’ve changed the load the bars are seeing and how much weight it’s transferring.
Think about it from a purely geometric and statics standpoint.
You want the auto ride height where it is leveling the vehicle when you setup the weight dist. because it will always compensate for load and maintain the same geometry.

Those that don’t understand these systems and how wdhs affect the forces on the vehicle and how these 2 systems need to consider how each other works and how that is different than just a simple spring suspension.
The nuances may not be great with a lighter tongue weight, but the heavier the tongue weight, the more important this becomes.


I realize mine was a Ford. But after you unhooked, and let the TV level itself. Then shut off the air ride BEFORE it lowered the vehicle. It held the level position. Then you could adjust the hitch just as if it did not have air ride. Then when done. you just turned it back on.

But you say GM air rides don't work that way?


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Grit dog

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Posted: 04/17/21 10:58am Link  |  Quote  |  Print  |  Notify Moderator

No, I’m saying different systems are different.
But you just said the same thing I was tryin to get across.
You need to set the bars when the vehicle is at normal ride hight. Not let the trailer squash the suspension, then set the bars, then let it air up.
However that is accomplished has nothing to do with the type of system, fundamentally, but is purely geometric. (Presuming an automatic ride height sensing system that attempts to recover the same height regardless of other factors.)

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