I have yet to upgrade to such a fancy setup. My next chase vehicle, which will hopefully have no internal space, will definately have more thought into the powering of my equipment. Then again, I'm not running much more than 3 radios and a 600watt inverter.
As for my current setup, my HAM radio and 600 watt inverter are both directly wired to my battery (which I replaced this weekend when the original FINALLY died). The inverter is under my seat, which makes it very difficult to shut off manually. In my marvelous ingenuity (which I probably can't spell anyway), I rigged a switch below my steering column which controls the inverter. I can leave the inverter itself in the 'on' position, and use the switch I wired and installed under the steering column to turn it off and on, which is much easier to get to than having to reach under the passenger seat.
From the inverter, I plugged in a power strip so that the outlets were easier to reach. I don't EVER use all 6, in fact, I will normally only use 2, maybe a third if all I'm doing is charging equipment. Usually one runs the laptop, one the TV, and the other to my video camera(s). This year, I have extended batteries for both cameras, and those batteries are interchangable, so hopefully that should pretty well eliminate the need to charge those on the road.
The rest of my gear gets plugged into an $8 radio shack 3-cig adapter I attached to the side of the radio console. I plug in my Davis Weather Station, my CB, and my Police Scanner into that. My cell phone charges from the cig-plug that comes built into the car.
Simple setup, but on the limited space I do have to work with, it's easier for me.
