I did not ask about larger fridges and did not ask specifically about diesel
generators but my experiences traveling in Europe a fair amount and a
detailed conversation about the propane generator and alternatives with the
Westfalia folks might help to give you a feel for how unlikely it is that
Westfalia has either of the options you are looking for.
First fridges. I did not see a larger fridge anywhere at the factory or in
the Kunden Center and I have not found one while poking around the Westfalia
website. In Europe, people have much smaller home fridges than we have here
in the US. Their fridges are usually 1/5 to 1/2 the size of ours. This is
probably in part due to their having smaller houses but they can survive
with these fridges because they typically shop for food once every day or
two. Often on the way home from work, a European will buy their perishable
groceries for the next 24 to 48 hours. Given this habit, they don't see the
fridge in the Westfalia as small. I am certain that they just buy
perishables frequently when traveling and this makes the fridge big enough
for their needs.
Now generators. Europe is quite a bit more temperate than the US. The
temperature just doesn't get to the extremes that it can in North America.
As a result, Europeans typically don't want or need an A/C in their campers.
It is very rare for a European Westfalia to have an A/C and when it does it
is a much smaller unit which neither draws as much current nor blows as much
cool air. While talking with the folks at Westfalia they were asking me why
people in the US want any kind of a generator. Without an A/C (and usually
also without a TV and microwave), they can't understand why a generator
would be necessary. Westfalia adds solar panels and charging systems to
many of their European units (possible without an A/C unit and TV antenna on
the roof!) and they have found that owners can camp without electrical
hookups for a week or even more while the solar panels keep charging the
batteries. It's interesting to note that along with the temperate climate
much of Northern Europe (where Westfalia-Werke is located) is cloudier and
rainier so less sunshine time than most of the US.
It sounds like their will be more room in the 2007 Sprinter based Westfalia.
The 2007 Sprinter is going to have a wider track and body and the Westfalia
(based on hints the Westfalia folks dropped) is probably going to be longer
as well. This may make it easier for Westfalia or private owners to install
things like larger fridges, diesel generators, or larger LP tanks.
It might be worth visiting the Westfalia site (
http://www.westfalia-van.de/)
and emailing them (infoservice@...) with your requests and
suggestions. Probably worth copying Airstream (tech@...) on said
emails as well.