If you are coming in from the West it is indeed HY36. It does not become 395 until you leave Susanville headed towards Reno. The hill is steep and long and you are still coming down when you make the turn onto the main drag through Susanville. There is no alternate route that I am aware of. We have been taking this route for years with travel trailers and motorhomes with a toad and have experienced no problems. As long as you realize it is long and just gear down or use a compression brake to keep your speed down you will be just fine. Obey the speed limits through Susanville and on over to Nevada there seems to always be one or two cops out there.
Brian, Loretta & Daisy (Golden Retriever)
2008 Holiday Rambler Endeavor 40 PDQ , ISL 400
2014 Ford Explorer toad