I'm on my way back from Yellowstone ... I live in Dayton OH. I left at midnight on a Friday and drove till 3am (4am with time change) to a nice rest stop just over the Indiana/Illinois state line. The next day I drove from there to another rest stop an hour or so past Sioux Falls SD. The next morning we left and made it into Custer State Park where we stayed for 6 days and went to The Badlands, Mt Rushmore, Crazy Horse, Wind Cave NP, Devils Tower, Wall Drug, Minuteman Missile Silo and about a million other things. If Custer was in any other state it would be a national park no questions asked. From there to Yellowstone was a solid 10hrs taking Rt 16 to the south of the Bighorns through Cody and into the East entrance. The Bighorns were a lot easier than I thought they were going to be. The way everyone around here talks you'd think you were driving to the moon. As long as you have more truck than you do camper you'll be more than fine. Onve past the Bighorns it's an easy drive. Just remember from Cody you are two hours to Fishing Bridge.... Which is where I stayed as well. My route was 70, to 74 in Indy, to 80 in Davenport IA, to 29 near Omaha, to 90 in Sioux Falls to 16 in to Yellowstone. And don't look at the times on google maps for drive times. Once you get on 29 the speed limit is 80 almost all the way to Yellowstone so the times are pretty skewed.
