For all the pnw guys....and everyone else in on the convo, I'll say that snow here in the pnw is unique and I never owned chains anywhere else before moving here.
Used them else where, maybe deep snow ona skidder road getting out of elk camp, but typically it's colder than here.
This snow is the worst for everything snow related. Doesn't get cold enough. Roads are 2x as slick here and yes just 6-12" of wet unplowed snow can stop a rig dead where you could blow right through fluffy snow.
Here they are almost a necessity if you get off main roads in the mountains in the winter.