This may be true with sealed beam 9004 bulb based lenses.  However, stock
Hella lamps and lenses are much higher quality than Silvania or Phillips, so
I would think a properly aimed and relayed stock vanagon light system would
not be much of a hazard to oncoming traffic.  Probably much less of a
nuisance than a typical SUV or BAT (big ass truck).  Better would be to put
E-code lights in and aim them properly.  Check this site out if you are
interested in proper lighting...
http://www.susquehanna.com/susq/other/useful.htm

I have used E-code lights on my GTi for some time now and very rarely have
people "flashed" me when they think my lights are on high beam.  The aiming
of these lights is very precise and makes a world of difference on the road.
Unlike sealed beams which are very difficult to control beam patterns,
E-code lights are designed to illuminate the ROAD where they are POINTED
which usually results in not bothering oncoming traffic.  Someday the US
will get smart on this.  Fortunately in Washington state where I live,
E-code lights are legal.

Rich Blake