Re: PA Speakers
I don't have any photos on hand, nor do I even have a TJ, but I do have a CJ that I had a PA speaker mounted. I opted to mount it on passenger-side mirror for a while. After I smacked it on a tree or rock (it's been a while), I moved it to the front bumper where the winch mounts.
I picked up everything from Radio Shack for relatively cheap, ran regular old speaker wire, with a regular old horn that cost me 15 bucks or so and used it a lot at races or while pulling someone out.
I'd suggest getting yourself a speaker and some wire, sit back, relax and imagine where it is you want to mount it and then imagine what kind of problems or hinderance that location will create. If it's not that bad, mount it.