Just a couple of notes since rode in SD last June and was planning to ride in NB:

1. Chadron to Hot Springs is a long stretch with very few services and zero shade. There is a bar/casio near the state line and allegedly a service station a local told me about, but I don;t think there is much else. The only camping in Hot Springs itself will be on the left on U.S. 16 just before you hit the commercial center of town. Expensive ($30) for what it is, but the tent sites have full shade and are right next to a little creek. Don't let the chamber of commerce information center steer you to the campground at the recreation area. It's several miles of hill outside of town. I gave up trying to find it and went back into town.

2. Argyle Rd. between Hot Springs and Pringle is not paved.

3. When you reach Pringle, the only commercial thing there is a bar/restaurant (closed on Sundays). There is a volunteer fire company. Maybe one of those places will let you cap there if you need to stop. Otherwise, taking the Mickelson, you next option is Custer.

4. French Creek Campground in Custer looked decent. It's right off the trail and two blocks from the center of town.

5. Crooked Creek Resort in Hill City is nice, and right next to the trail. From there, there is only one commercial place (restaurant in Rochford) and no camping that I found until you reach Lead.

I will PM you with more later.