Hey there David, GoWesty has a good Tire Recommendation page in their library: http://www.gowesty.com/library_article.php?id=683
I recently put on Nokian Entyre 225/60/R16 on my 2003 MV Eurovan. They have a 102 Load Index and a really good tread ware rating (+ they are "green" tires w/ low rolling resistance). $152 a piece, not cheap, but nothing seems to be on these vans! Also, with 225/60 I am still able to add chains to the front tires. btw..thanks for the posting about increasing the leg room.