Traveling out West from Indiana with 40' Motorhome pulling trailer w/jeep in late August.

You’ll have about 6 full days of driving (3 each way) (maybe 7 depending on stops) that leaves 4 days at best of being a tourist. In my opinion Yellowstone is the only thing you’ll be able to realistically see; and you’ll only be getting a brief tour of that.

You can do short stops at wall drug, corn palace, devils tower, little big horn, mt Rushmore, etc. along the way, but that will be about it.