Last summer (when I was still a low-rider on 31" tires and a BB) I went with a group up into a local canyon for a night run. I am second in line:
On the way down, I got high-centered when my left rear lower shock mount got caught on top of a rock in a pocket-shaped cavity. Due to the angle of the ground (and the fact that it was wet/muddy), nobody felt a high lift jack was a wise choice. I was in the lead, so nobody could pull me forward. The guy behind me tried pulling me backwards, but he couldn't get any traction in the mud. What to do?
That's when Steve pulled out his air bag jack.
He put it under the driver's frame rail in front of the rear axle. In seconds, this thing lifted my Jeep straight up and off the rock. This made it simple for us to shove some loose rocks under the left rear tire:
After that, I drove right off the obstacle. Slick.
After seeing this rescue, two guys in the group ordered their own air bag jacks the very next day. Seriously.