Air bags and weight distribution--which comes first?

Our current tv has timbrens on the rear axle, which are always "aired up". When installing and adjusting the equalizer wd hitch, the rear end of the Yukon did have some squatting even with the timbrens, and the front of the truck did go up some some, so I was able to adjust the hitch to get the front of the truck to the halfway point. I have had no problems with this setup, and the truck is very stable with the timbrens installed.