I would argue that the condensation issue is a good argument against using fiberglass or other porous insulation. The cold metal of the inside walls may condense any warm moist air that reaches the skin.
I'm a white water paddler and often have wet gear and even canoes inside my Sprinter. I foamed the walls with Dow Great Stuff and it does a terrific job. The van dries out in a very short time. The old uninsulated Econoline got that musty old-car smell but the Sprinter is quite fresh with a few minutes of an open door. We enjoy our Fantastic Fan but don't use it much as a dehumidifier.
The windows are cold enough for night time condensation to form but have never seen moisture on another surface. We do cheat and use the diesel furnace at a "single comforter" setting for sleeping.
It is now 8 years old, and it still works, but the busings on the sealed motor are worn out and it makes too much Noise. So I've removed the battery, and covered the solar cells.
850 cubic feet an hour is not really enough when it gets hot, but it was enough to keep a lot of condensation forming.
I wound up building a step down ring, and use a 4.75 inch Variable speed Silverstone fm121 12 volt computer muffin pushing air through the 4 inch hole of the Nicro Vent.
Now with a side window open, I can boil pasta inside without fogging the windows.
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