How is the road between these two cities? It is a gray road on my map and there is no highway number designated. I would be driving a 40' motorhome and towing a car.
My mapping software shows the direct road is via US Forest service road. I didn't remember any direct route I would not take it. Suggest going up US 395 to Colville and taking WA 20. Or consider south on US 395 to around Deer park then east on county road (Crawford Ave) to US 2 then north to WA 211 then WA 20.