***UPDATED with installation pictures page 3.  Click HERE***

I've run them in all my trucks and my dad's, my brother's, etc, so I know how they work.  I know bentparts even had a set for sale on the Classifieds here recently.

I'm tempted to do it to my 90 Tracker 2dr, if needed...I think too much of a load will cause the rear end to sag, which is okay, but if I do it too much I know the rear end will begin to sag PERMANENTLY, and I don't want that.

I'd love them for DD usage because I've had great luck with them in the past, but what about offroading?

Will they limit rear flex, and/or wear out prematurely with a lot of rear axle motion?  

Don't want to waste my $$$ if I'll beat them to hell in a short period of time

If I run mine without air I don't even notice their there, actually get too much flex without them. They make great soft bumpstops when you do put a few lbs in them though, but still allow plenty of flex. I found a set of the Airlift bags for a Chevy that are the same diameter as the Trackick ones, but 3 inches longer. They work great with the 3.5" lift coils I have in the back. The Bags that are meant for the Trackick' will need some kind of spacer if your using longer coils. I'll try and find the part# if you want. BTW, next time I have my front end apart for maintenence, I'm gonna try and fit the old stock bags in the front coils, to act as soft  bump stops, and with a bit of air It may help keep the coils from sagging there too. I know if I pump 'em up to max press in the back I get another inch of lift. Just the thing for that deep water!   Btw, I've been using them for 4 years without wearing out anything. Pretty tuff stuff, and their cheap, $89 complete kit JC Whitney.

Yes, I was thinking the OE-spec rear bags would fit the 3" lifted front coils nicely.  I'd greatly appreciate it if you could pull up a number for those Chevys you have in the rear.  Are they Air Lift, Firestone, or another company?
When you wheel, do you deflate them a little, or remove a valve core, so they can inflate/deflate as the suspension travels and compresses/extends them?

When I wheel I generally keep a bit of air in them just to keep my wheels from stuffing into the fender well to far. For flexing it's a non issue. I don't remove the valve core, don't want dirt getting sucked in there. Mine are Air Lift from JC Whitney. I'll get you that part # when I get a chance,  been working lots of hours and haven't been in my shop for a while. If your in a hurry and got a few minutes, I just called AirLift and spoke to a tech to get the # for the kit. I just told him what I had and asked for available longer bags.

I fitted a small set of air bags in my sidekick workers pretty good

Nice job noisyjack, the only thing that would concern me is their vunerability to rocks, tree stumps etc. That's another good thing about the air lift's, bag inside coil , more protection. Still though, I bet you can adjust ride height more with that type of bag.

About three to four in. of lift  I had about 600 lb. in the back with a little bit of air in the air bags and was good to go       (no back seats.)

Seems like a good idea.  Bentparts, no hurry, so whenever you get that part #, let us know.  Whether or not I'll actually do it, at least your info could help someone else if they search and this thread pops up.  I'd have to wait and see if I even have a problem with loading gear in the back.

Depends on how much you load, but I mainly put mine in for when I tow my little pop up trailer, the little bit of tongue weight would pull it down a bit. I'll be in the shop today and look for the number's.

Thanks.  I may (or may not) have any issues, but I'd like to have this info ahead of time in case I do decide to do it. 
Like the idea for putting the OE-spec rear bags in the front coils.  Would make perfect sense if you had sagging coils (probably ride better too).

I ride with about 2 to 3 lb.in the air bags and does not effect the ride .The thing that's effect the ride is the 31x10.5x15       6 ply .  In a 2000lb. ridge

Noisy- now I see how you hauled a full moose without dragging you receiver hitch in the dirt.  Bent, I would like that part number also.

I bought two set of air bags at a sale. Put one on my 2006 Chevy and the outher one on the sidekick. Don't know what there were made for but I will see if I have the box that they came in Had to make up brackets for both of them..

Here is the moose on the rack and in the back of the sidekick

Damn.  Is that with the air bags or before you installed them?