I have been waiting to get some shop time to install my airbag system on my H2. I got all the parts from airbagit.com, including an in-cab controller, etc.. I already have the tank and compressor installed, just need to find a place to mount the rest of the electronics and get the brackets installed. Airbagit sent me an extra airbag for free to keep as a trail spare, but told me I most likely would never need it, because the bags are super strong. I also have some schrader valves that I can install inline of each bag, after a check valve and the solenoids, so if the electronics fail I can still put air in the bags with the compressor. I'll get everything installed one day, but its not high on my priority list.
Ron, the biggest concern I had was the bags unloading to fast when off camber, but airbagit told me that they will not unload any faster than the coil springs if they are under pressure.