Hello again,
I don't see the camera unit on the front grill, but that doesn't necessarily mean you haven't got one.
It could be in the grille.
I doubt you have the three cameras as they protrude so as to be able to monitor sideways.
I don't recognise your headunit.
It does not appear to the top of the line HDD system.
However, it does have the button for the sonar.
As the console below the headunit is standard it does not confirm sonar, or not.
When you get the vehicle, if it has sonar it will have the sensors at the four corners, and pressing the sonar button will activate (four green leds) / deactivate it.
It WILL be comfortable. You'll be very pleased.
Your 2006 should (will) have a five speed auto gearbox. 2004 is four speed.
As I said, I don't recognise your head unit, but most do not work 'correctly', in the UK.
CD should be OK, DVD too, radio not so. Sat Nav NO.
You will either enjoy learning Japanese or be frustrated by it !
While you wait, read about fuel and the head unit (and replacement) on this Forum.
Also I strongly advise you purchase JPNZ Alphard Manual FRO396. £25 ish, and worth every penny.
Be prepared, buy it now.