I mapped out the approximate route for the trip out west. It's here on Google Maps.
Thursday will probably be a little on the brutal side, but we're still going to see Mt. Rushmore that morning if I have something to say about it. Fifteen minutes, get some photos, off we go, through the mountains. Because of the distribution of somewhat populated cities, that was pretty much the best I could do in terms of dividing it up in reasonable parts.
We'll see if that map changes at all once I book some hotels.