Re: Hyw. #2 through the mountains.
While there are some climbs and decents from say, Sandpoint through Bonners Ferry and East into Montana to Libby and Kalispell and over to Browning on the East side of Glacier Natl. Park, there is nothing that you'd need to worry about route wise. It's a beautiufl drive to Kalispell, MT from Sandpoint, ID and Hwy. #2 skirting the Southern end of Galcier Park is practically level and follows a river valley for part of the way.
Steve & Lynette
2014 Newmar 3103 BAYSTAR/Triton V10 w. Banks/05 Honda Element toad