RE: Where 12v outlets?
Assuming you have an aux battery, then on the forward wall of the sink
cabinet, behind the drivers seat.  Easiest to wire to the aux battery and
puts all the wires in a corner out of the way.  I also have a 110v ac power
strip mounted on that wall and plugged into the extra outlet for the fridge,
under the sink.  That puts all the recharger cords, clamp on 110 lights, etc
out of the way where you don't trip on them all the time.