Fire extinguisher types depend on the need and your preferences.
CO2 and dry chemical are the best commonly available extinguishers for car
fires.  Yes, the dry chemical types leave a corrosive mess that must be
cleaned up, but they put out far more fire for their size than CO2 in a
typical car fire.  Since you have that big CO2 extinguisher, take it along
and use it first, since it leaves no mess.  Then if it doesn't get all the
job done you can finish off with your dry chemical extinguisher.  When
shopping for extinguishers, go by the numbers, and get one that is refillable
and has a gauge.  Your 10A5BC is very small.  The bigger the number, the more
fire of that type it will put out.

          w                                                  (@)  .
      wwww                                                       .
    wwwwww          ____vw    \______                .
  wwwwwwww       )____(______)____\              .
 wwwwwwwww     ///____]|[____]|[___I \             .
        |   |             [_| VANTAZTIK |-___  ]            .
        |   | * * * * * ='''''''( o )''''''''''''''''''''''''''( o )'''''= .
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~.
         Zoe Ann & Roger Banker             .
   1987 Syncro Adventurewagen      .

In a message dated 9/5/99 5:28:42 AM Pacific Daylight Time,
gmbulley@BULLEY-HEWLETT.COM writes:

> Which extinguisher do you folks prefer for use in your Vanagon/Westfalia?
>  We still carry a little 10A5BC (I think) that came with the Westfalia. I
>  would hate to use that thing because of the hideous mess that dry chemical
>  extinguishers make.
>
>  SO, in addition, I usually throw in a gigantic 39lb CO2 extinguisher I own;
>  it actually carries 15lbs of CO2.