Vizualogic Headrest and visor system.

[Hummer Man]

I would get SOUND ADVICE to do it. There audio / videoc tech guys knows what they are doing. They are also a big company and wont just leave you hanging out to dry.
You must do a serious power run (dead run) from the battery to the second row seat along the driver side step plates. There is a great access to enginge compartment near steering colum. You can then install a relay to break that ciruit so it only works when the key is in the ACCESSORY MODE. _____NO DEAD BATTERY THAT WAY_____.
You will need a 500 to 750 watt inverter to run a PS2 system and get good quality play.

If you install the visor monitor and possably the headrest monitors you might need some additional video amps. I used Monter Cable amps.
39 to 49 bucks. I ran all wiring and let the SOUND ADVICE boys tie it all together.