Here is the list of the differences in options on the Multivan, that are
not on the Carat, (As per the information listed the www.vanagon.com
website):

Only on the Multivan:

       C. Exterior, body
          Clearcoat metallic paint
           Height:  80.9"

       D. Interior

          Air conditioning with outlets in rear only
          Removable screen for hatch door
          Two person overhead sleeping loft
          Rear clothes locker

Only on the Carat:

       C. Exterior, body

          Paint choices: Pastel White, Orly Blue Metallic, or Bordeaux
Red Metallic (burgundy)
          Height: 75.9" / 1.93 meters

       D. Interior

           Digital LCD clock
          Air conditioning with outlets in front & rear

I think that their might be screens on the Multivan windows too. There
may also be some styling changes too. I'd be happy just to find a
"overhead sleeping loft" kit for a Carat!

Thanx,
Terry