Thanks to all for the good reminders about tires. Bus Depot has a good
page about tires for the Bus and Vanagon: http://busdepot.com/details/tires.jsp

I just ordered a set of Hankook RA08 all-season tires from them. The
reviews on the Roadhaus tires page all seem to indicate this is a good
choice for both quality and price and they meet all the specs.