Purchased our Sienna XLE Ltd. AWD in Dec. '03 and have 16,000 miles on the vehicle. Loved it until a few months back when the ride was getting rougher and rougher - lots of road noise. Discovered the Dunlap run flat tires were wearing unevenly, causing cupping and chattering. This was at about 14,500 miles. Toyota claimed they had never seen this problem and completly replaced my tires with brand new Bridgestone (still run flat). They did tell us however, these new tires will only last about another 15,000 miles and will cost us 200+ per tire ..... also, tires very hard to find - no one has them in stock in Metro Detroit area. We bought this vehicle thinking it would worth the money - high quality, low depreciation. Now that we're going to have to replace all tires (expensive tires) on a yearly basis, or even sooner, where is the savings of buying a Toyota. We can't put on regular tires - no room for a spare. We are seriously considering selling this vehicle because of this tire issue. This is a minivan, Toyota...not a Ferrari. Minivan tires should not only last but be reasonably priced and easy to find. You blew it on this one. I want my money back.