So, as soon as I got home from work, I broke out the TAJ and set it up under the FJ. I started her up, slipped the funnel / nozzle over the tail pipe and then watched her inflate..
And inflate..
And finally stopped inflating before the wheels were free of the ground. It looked like the bag still had between 4 and 6 inches of play in it, but it just couldn't get it up enough to completely lift the wheels from the ground.
When y'all get your jacks, please try them out and let me know how they work for you.