Your biggest areas of concern for winter travel on I5 from Ca to Or are: just north of Redding as you start the grade to Lake Shasta, Dunsmuir, which becomes a real hole in a snowstorm, Yreka to the Oregon border can get shut down for days at a time, depending in severity of the storm and obviously, Siskiyou Pass going toward Ashland. After I retired, I lived outside of Yreka, and had to make trips back to the Bay Area in the winter - not always a good time. I have seen I5, between Yreka and Siskiyou summit shut down with cars stuck on the freeway for several days until they can get it cleared (locals were carrying food to the stranded motorists then). Just really need to watch the weather - closely.
2019 Tiffin Allegro Open Road 32SA
2008 Jeep JKS Toad
F53 / 24000 # chassis