For 110V duplex outlets.......
Check the underside of any cabinetry in the kitchen area.........we have two 110V outlets there. I added a multiple outlet to the 110V outlet under the dash in front of the co-pilot. There's another on the underside of the cabinet behind the co-pilot seat. I also added one of my own on the wall behind the driver's seat.
For 12V outlets......
Factory equipped, there was one in the dash near the radio, and like Iggy mentioned there is one where your TV boost button is near your amplifier and such.
Installing multipliers from auto accessory shops is a quick way, as long as the total draw doesn't get too high. Installing your own 12V outlets is a piece of cake. Just tap into any 12V source wires on the underside of the dash........some are "live" all the time, some are controlled by the ignition key...............your choice.
Ken and Terry
2010 Georgetown 330TS being pushed by our
2017 GMC Terrain toad (4 wheels down)