Collective wisdom over on AstroSafarivans.com seems to indicate that a lot less trimming of the body work at the rear of the front tire well (near the doors) is required if you're a bit more conservative with tire diameter.
Looking at how much I like the tall/skinny look on Vanagons, etc., I was thinking of trying a 215/85-16 (30.4" nominal) on OEM 7" wheels. These are available in a variety of AT and commercial traction tires, usually load range D, which should be just-enough-kill on my Astro, balloon out nicely for SoCal desert sand, and give a decent tread life...