Evening all! so here's my opinion on air ride.
I've done a lot of research but all of the following are just my thoughts and conclusions.
There seems to be one recurring feedback for both adjustable coliovers and air ride and that's buy cheap, buy twice. I therefore was only interesting in fitting top end kit to my brand new van.
My prerequisites: want full auto management system; want full 4 way adjustability so I can level on uneven campsite; want memory presets so I can a) set a low drive height for posing b) set a higher drive height for driving c)reset to previous level on said campsite; want to be really low when aired out (I need to get the van in my garage); want it all hidden away underneath the van; once fitted, don't want to have to worry about it going wrong.
So I've gone for HPDrivetech Bilstein struts front and back with Airlift 3P management system. All that comes in about £3500 plus fitting c£800. You might end up adding a few extras eg compressor silencer.
You can get cheaper struts eg Airrex and cheaper management systems (even manual ones) and you can get more expensive management systems like Accuair.
For me the Accuair doesn't give you anymore features that I actually need so it wasn't worth an extra £500 to me. There seems to be lot of negative feedback with Airrex struts so much so my fitter won't fit them.
So in my opinion, I haven't gone most expensive (c£5k) but have got what I think is the most common, up to date, top end system.
There are lots of very good fitters so might be better for you to choose what's local. Mines in at StancedUk in Wokingham, I like the guys there and I really like the fact they sell wheels and tyres as well and they are happy to trial fit different size wheels to settle on what will work best for ultimate 'stance'.
Other reputable fitters I'm aware of include Plush Automotive, LowPro, JPL automotive.
I'll pause there for fear of boring you to tears....
Any other questions just ask