There is a lot of mis information about air bags for some reason. I've been running them in a well modified Jeep TJ for about 5 years and in the LC for about a year. I've run them off-road, on-road with no load and with a large load and haven't found a downside yet. I've run up to 30 lbs in the LC to level things out and it rides great. In my Toyota mini truck, I've run air shocks for the last 13 years with no complaints and in spends half of it's time towing 4000 lbs plus of landscape materials. Again, no downsides that I'm aware of and yes, I have a brake controller and trailer brakes before I get flamed for towing that much with a mini truck.
One snag that I did run into with my LC install was that the hole in the spring perch was not centered with the nipple in the air bag. (Nipple and airline pass through the bottom spring perch) The edge of the first hole I drilled made contact with the nipple and caused an air leak. After taking it all back apart, I used the brass nipple on the airbag to "mark" the spring perch. Basically just wobbled a slightly inflated bag to see where the nipple would contact the perch.
End result, with original hole, was an oval hole in my spring perch. Nipple doesn't contact the perch now and it doesn't leak. Hopefully my picuture comes through so you can see what it looks like.
Adam R.