I have these also that I moved over from my JK. They actually seem to work better in the JL. Mine seem to be tighter due to the larger size of the rear roll bar in the JL.
Dry chemical extinguishers are problematic because they can cause electrical gremlins afterwards, as I understand it. Halon are safer. I keep one of each (sorry, random stranger on the highway, you're getting my dry chemical).
Just double-checked: I have the 2.5 pound.
I tell everyone they should have one regardless of what they drive. A woman a couple of hours from here burned to death after being rear-ended by a large trash truck; I doubt a handheld fire extinguisher would have saved her, but had I been there and not had one with me I would have felt absolutely terrible.
Yes, it's a widely known issue. There is a facebook page dedicated to burning wranglers full of tons of photos of wranglers burning along the side of the road, in parking spaces, etc. I have two friends from my local club that both lost their JK's due to fires. That said, it's a good idea to carry a fire extinguisher in every vehicle. If you get to the fire early enough, you might even be able to put it out.
