not specific to Vanagons (and indeed may not work completely in
Westies/multivans) but the "Car Talk" guys have written  good column on one
way to adjust your mirrors.

http://www.cartalk.cars.com/Columns/mirrors.html

Alistair
--
'82 Westy -> diesel converted to gas in '94
albell@uvic.ca
http://members.shaw.ca/albell