Best roads between Nevada and Washington state?

We stayed in the "Hi Desert" RV Park in Winnemucca after towing from Klamath Falls on Highway 140, a delightful trip for us.

This was the first (and so far, only) time that someone came out from the office to greet us, told us where our site was located and suggested that we go ahead and get settled before coming back to the office to register. I still remember that with appreciation.