Woo Hoo! My wife and I are based in both Kalispell and Pocatello. Let me tell you, that run from Butte to Idaho Falls (and more so in the other other direction, 700 feet elevation gain) is Harsh in zero degree weather. Not so bad when Joulie was new, but after 92,000 miles and 8% battery fade, we've had to draft at 50 mph behind a big rig a few times. Nerve wracking and uncomfortable.
We're planning on putting in a HPWC in Hungry Horse, MT in the Spring, FYI