Originally Posted by GoldDog
The Quadra-Lift air suspension system provides full time load leveling.
According to available information, the system should be in the Normal
Ride Height Mode when installing a weight distributing hitch and
setting the vehicle up for trailer towing. Allow the system to
auto-level and then set
up/adjust the weight distributing system accordingly.
I have the 4-corner air suspension on my RAM and had the same question regarding the proper way to hitch up. I suspect that your suspension will probably behave the same way mine does. I was trying to set mine up and adjust it per the hitch manufacturers instructions with the suspension active. Even though it seemed to be adjusted properly once I got down the road a short bit it just didn't feel right.
I finally found what for me was the right advice on a RAM Cummins forum - which is essentially disable the suspension before dropping the coupler on the ball and adjusting your weight distribution. After you've adjusted the weight distribution then re-engage the suspension and it should have little work to do. If you are using wheel well measurements to adjust your weight distribution make sure you take those before and after while the suspension is still disable. On my RAM the suspension is disabled by entering into "Tire Jack Mode" via the UConnect console. There should be something similar on the Jeep.
One other thing I discovered - normally you adjust the ball to be slightly higher than the coupler when the trailer is level and allow the tongue weight to bring it down. With the air suspension I had to drop the ball down so that it was about even or just a wee bit lower than the coupler when the trailer is level. This prevents the trailer from ending up slightly nose high as the air suspension will lift the rear up to the height it was before the tongue weight was added - essentially returning the ball to the above level height it started out at.
This procedure works very well on my setup. I continue to disable the suspension every time I hook the trailer up now and I'm getting consistent results from the weight distribution adjustment. I am getting 100% FALR (verified at CAT scale) and the trailer is always level regardless of what the tongue weight is - mine varies from around 425-475lb depending on how the trailer is loaded.
Hope that helps - and good luck.