[keeponvaning]

Once again - this is a waste of time and money unless all you are interested in is being able to raise or lower your rear end.
Anyone who thinks this is going to give them a better or more stable ride is only fooling themselves. I made the same mod on my ‘14 and suffered with it for 4 or 5 years before I sold the van (the buyer removed them and fortunately I had saved the parts I removed so he could reinstall them and bring it back to stock). I had a compressor onboard and spent more time fooling around setting the pressure every other day because of leaks that were next to impossible to find let alone fix. It does not give a better ride it only is useful for adjusting the rear end height and you need to constantly do it.
Sumo springs seem to be a far better option (although I have no personal experience with them) from all the reports of members who have installed them. Just changing the rear shocks to the Bilsteens B6s was and is also a vast improvement.
Sorry to bust anyone’s bubble but I lived and suffered through this so called "improvement " for far too long.