I've used the Midland 75-822 handheld for some years.
Just plug it into your power outlet (lighter socket) and you're good to go! Or with the included accessories, you can add some NiCad or AA's and go for a walk about with it or if you’re stuck and with poor reception, you can hike to the nearest hill for better reception to get help or flag down a mate. You can also add an external antenna too!
Sorry, I don’t think it supports a PA, but you might want to check the spec’s at the attached url, just in case, just that I’ve never needed a PA.
http://www.midlandradio.com/CB-Radio.WYQ/75-822