I live in Layton Utah right off I-15. I am leaving for my mom's winter quarters in Laughlin NV next week. Her summer quarters are in Chewelah, just north of you. She likes to do 395 to Kennewick, I-84 to I-15. I like I-90 to I-15. Either way, I feel the more major routes are lower altitudes and better cared for. You can go 395 all the way there, it might be prettier, but I'd feel it might be slower and more weather problems.
2006 Monaco Safari Cheetah 40PMT