We've made it to Hardin, Montana, and I'm writing this from the Super 8. Their wireless doesn't work at all, but fortunately they have hard-wired ethernet in each room as well, so it doesn't really matter. When in Hardin, I suggest eating at the Purple Cow, a very local eatery with large portions and good service.
We stopped at Wall Drug, South Dakota today, as well as the Vore Buffalo Jump and the Little Bighorn Battlefield site.
Now pardon me while I go crash, I drove 600 miles today, and my biological clock is still an hour ahead of local time.