I recommend going in on I 90 to 89 south in Livingston to Yellowstone National Park from the north, much easier way to get into the park. We stayed at Yellowstone's Edge RV Park 3502 U.S. 89 Livingston, Mt 59047.
You probably can’t get a place in the park if you don't already have reservations. There are few places to park when towing in the park. You will want to do your sightseeing in your truck. I was glad to have my toad with me.
That means the easy way to Devils tower is back on I90 to 14 to 24 that will take you into Devils tower area.
The road into Yellowstone from Cody is a lot more climbing and there was a lot of road work going on.
When you go to the Little Bighorn site take the tour offered by the Indians they will give a different perspective.
Hope you enjoy your trip I know I did.
Bill
