I have a 2007 Acadia (AWD) and was shocked to discover this week that there are very, very few winter tires available for this vehicle. Apparently 19" tires are quite an oddity. The second tire dealer I spoke to was finally able to locate four tires in Portland (I live in Northern Canada) which may arrive here in two weeks for $1800.00! I phoned the GMC dealer and they confirmed that there really aren't tires available for this vehicle!?!