Its been said before but is worth repeating...
Make sure you get the correct load index for your tires.

At very least your tires should have a load index rating equal to 1/2 the GAWR (Gross Axle Weight Rating)  (Each wheel takes 1/2 the total axle load.)

Roadhaus has a great tire review section on his website
http://www.roadhaus.com/tires.html

 -------------- Original message ----------------------
From: Paul Terry <paulterry@EARTHLINK.NET>
> Pat,
> I'm in the same boat, but I had 14" rims with street tires. I have purchased a
> 15" rim set but can't decide whether top purchase the Michelin Hydra Edge 215 65
> 15 (as recommended by the folks at GoWesty) or the Michelin Agilis 205's.
>
> PAUL
>
> -----Original Message-----
> >From: Pat Little <redtail@CABLESPEED.COM>
> >Sent: Oct 17, 2006 6:58 PM
> >To: vanagon@GERRY.VANAGON.COM
> >Subject: What tires for 91 Westy?
> >
> >I recently bought a nice 91 Westy and have been driving it around on short and
> medium trips. Now I'm
> >preparing for longer jaunts and want to get better tires before I set out. I
> plan on driving a lot
> >of driving dirt roads and probable mountain snow conditions.
> >
> >The tires I have now are Jupiter SV-820 185R14 C,
> >and the spare is different - a Michelin MXL 205/70R14
> >
> >The symptoms I have which I would like to change are:
> > - van sways in crosswinds or behind large trucks
> > - tread noise when on smooth surfaces
> > - lots of noise traveling on dirt roads or Seattle's badly eroded concrete
> highways
> >
> >From what I can gather online the Michelin Agilis is highly recommended,
> although it has poor snow
> >traction. Bus Depot says the Hankook RA08 is way better than the Agilis
> (suggesting the Agilis is
> >the standard to beat?). I can get the Agilis for $127 and the RA08 for $75. So
> I'm thinking the RA08
> >is the one to go for.
> >
> >My questions:
> > - how "bad" are my current tires (i.e. will switching tires fix some or all of
> my problems)?
> > - any thoughts on RA08 vs Agilis? especially in snow/mud (I'll be carrying
> chains, of course)
> > - is it important to have a spare that is the same type of tire as the main
> ones? (is driving with
> >3 of one and one of another safe?)
> > - what pressures should I use - VW recommended or can I go lower for a
> smoother ride, if I buy
> >"good" tires with stronger sidewalls?
> > - is 185R14 the 'best' size for my needs or would I be better looking for a
> 205/70R14 (the other
> >"official" size according tot he tire pressure plate inside the driver's door)?
> > - do I need to consider upgrading my shocks as well? (no idea what is on it,
> but I expect is
> >original factory gear)
> >
> >Regards,
> >Pat Little
> >Seattle