AGM, Glass Matt batteries are the best for this situation.  Expensive but will outlast and out perform all others.  Size my be a problem depending on where you want to put it or them.

On 2011-03-13, at 11:38 PM, Automatic digest processor wrote:

> Hi,
> I have to replace my aux battery, a NAPA 8G27 (99 AH) gel type. =
> I=E2=80=99m looking for the best autonomy with my fridge to be the main =
> power expense. The venting is no problem. I=E2=80=99m looking at 3 =
> alternatives:
> 1- get 1 of the same battery type
> 1- 2 acid type 6V batteries in series
> 2- 2 acid type 12V in parallel
> 
> Is there a better solution out there?

       Please note that I will be away from my business travelling from December 06 until April 30, 2011.  Parts orders will be processed although not as quickly as usual.  I will always be available for contact by E-mail.  If you phone your call will be addressed by Greg T. Brown here and he will either call you back or advise you to contact me directly by E-mail. Details of this adventure are on our Travel Blog: http://frankcondelli.com/travels/

Cheers,    

Frank Condelli
Almonte, Ontario, Canada
'87 Westy & Lionel Trains (Collection for sale)
Frank Condelli & Associates - Vanagon/Vanagon Westfalia Service in the Ottawa Valley Vanagon Stainless Steel Exhaust Systems
BusFusion a VW Camper camping event, Almonte, ON, June 09 ~ 12, 2011