My wife, our two pugs and I are scheduled to take our 2010 Gen III (17" rims) and head up next weekend to Washington state (from SoCal) for Thanksgiving. However after checking out Oregon's TripCheck site for weather/driving conditions over the next week or so, I am getting cold feet (pun intended). The forecast calls for snow and rain showers all along Interstate 5 in the Siskiyou Pass northern Cal/southern Oregon (Ashland etc) area. I have the stock tires on my Prius (Bridgestone Turanza EL400 - P215/45R17) and they are in good condition. I plan on getting SCC Z chains for the front two tires (although I have heard considerable conflicting information about using chains on Prius with 17" rims from dealers in SoCal, Denver and Medford). Our route calls for us to be on Interstate 5 all the way up so . . . should I go or cancel and just plan a trip in the spring?