I went through this same thing regarding trying to find an aftermarket air system for my 2010 EB. I'm curious to see how the airbagit and airlyft systems work. In my case I'm pulling a 30ft travel trailer and using an Equalizer brand wdh. As mentioned, a little bit of sag is ok according to the Equalizer support team as long as the front axle is planted correctly. I've moved my hitch height, added/removed washers on the system to try to get a more level line but what really helped was raising the wdh bar height settings on the trailer. The more aggressive setting has almost removed all sag.
This weekend I swapped out my old strut/shocks to a set of Monroes and the truck is sitting almost 2 inches higher and feels much more stable, less body roll. I'm betting those old struts were contributing also to the sag and hoping when I hook up the trailer again that I see even more improvement.
If you have over 50,000 miles on your struts/springs you might want to look into replacing those and see if it helps.
This weekend I swapped out my old strut/shocks to a set of Monroes and the truck is sitting almost 2 inches higher and feels much more stable, less body roll. I'm betting those old struts were contributing also to the sag and hoping when I hook up the trailer again that I see even more improvement.
If you have over 50,000 miles on your struts/springs you might want to look into replacing those and see if it helps.