I have found it useful (so far) for a few things. A slightly quicker warm up, and higher alternator output when jumping someone else's rig and when winching. I'm sure there are others out there that could chime in, but that's my findings so far. I don't have working AC yet, so I won't be able...
I originally wrote this up on jeepforum.com, and got some of the information from NAXJA. I figured there are probably some folks on NAXJA that aren't on that forum, so I wanted to show some love to this forum and put this out there for others who may want to do the same thing.
The thread...