Hi-
Suitable 15 inch tires are few and far between.  The Tire Rack says the Michelin Agilis will take 4 months after being ordered!
Looking for alternatives I came across Nokian Tires http://www.nokiantires.com .  Made in Finland they are mostly aggressive snow tires and rally competition tires, but they do have one called the Hakkapeliitta CS (no my keys aren't stuck).  In the size that works for my 15 x 7 wheels, 205/65R15, the load rating is C 102/100Q.  Pretty good.  I have a set of Hakka snows for my Jetta and they're great.

Anyone have any experience with this Hakka CS on a Vanagon?

Gary