>
> RE:
> Does most of the air being moved by the stock rear fan come out of that
> grille on the left side (as you look at it) of the stove/fridge unit?  If
> so, I wonder if anything would be gained by adding a fan there... sort of
> a
> booster for evacuating the hot air.

The original fan is trying to draw air from the floor area inside the van,
up the back over the cooling fins, and out both the grill you mention and
the  grill across the back of the stove/sink unit.  That puts the hot air
right back into the van.  The idea of the exhaust fan mounted in the city
water inlet is to get the hot air out of the van.  I've tried a fan on the
gill over the cabinets and found no apparent difference in performance.
Those that have added the exhaust fan to the outside have reported improved
cooling especially when the ambient temperature is high.