I need advise on winter driving, which I know nothing about since I live in Los Angeles. I'm planning a trip to Mammoth this winter on my 2004 outback. I've yet to drive my outback in snowy conditions. Will the stock tires on my outback be ok for occasional visits to snowy conditions? Do you recommend using tire chains? What type of chains and on which tires? Owners manual does not recommend use of chains, but I've heard people using it on outbacks.