Agree with CPAULSEN, take the coast route. In your case come South to Longview Washington then cross the Columbia river into Oregon and head to Astoria. Follow the coast South to Hwy.20 in Ca. then back to I5. Take your time and just hole up if you hit a storm. Winter storms on the coast can actually be fun if you are parked and surf watching. In the winter camp sites are readily available which makes it even better. I would suggest you still carry chains just to be legal we do but have never put them on. Once back on I5 South to 58 over to I15 connect to I40 East to Arizona or just take I15 North to Sin City then go over to Arizona. We like the area around Bullhead City AZ and on South following the Colorado river.
Brian, Loretta & Lucy (Golden Retriever)
2008 HR Endeavor 40 PDQ , ISL 400
2010 Dodge Ram 1500 Toad