Washington’s chain requirement for 4WD requires that they are carried, not that they are used / installed. I want to say it’s the same for AWD (but they count some tire socks). Not sure about the Tri-peak snow rating.FYI in Oregon and I believe Washington also, 4WD vehicles with snow tires with the little snowflake symbols on them don’t require chains, they surpass the requirement. I’ve never been checked to see if I’m carrying chains in Oregon in my AWD Denali. The owners manual states to not use chains anyway.