Last summer I made 5600 mile loop out west from Tennessee. We were out 8 weeks. I recommend stopping at Badlands N.P. in South Dakota. We camped in Custer State Park just outside Rapid City, S.D. for our base camp to sight see from. From Custer we saw Rushmore, Crazy Horse Memorial, Wind Cave N.P., Jewel Cave N.P. , and Custer State Park is pretty awesome also. Iron Mountain Road goes from in the park to Rushmore, Needles Hwy (needles tunnel 8'4" wide my dually barely fits) goes to Sylvan Lake which is really beautiful and the rock formation on Needles Hwy are unbelievable. Custer Park has a Bison Herd and an Elk herd. We stayed in Game Lodge Campground. (you need reservations there by Jan 1st or earlier. We spent a couple nights in Onawa, Iowa at On-Ur-Way RV park very clean and $30.00 for full hookup. You can also stay at Lewis & Clark S.P. (they're a couple miles apart) it also a nice park but not as nice. We stayed at Buffalo Crossing RV park in West Yellowstone. While in West Yellowstone be sure to visit the Grizzly / Wolf Discovery Center I loved it and the boys liked even more. I would advise going north of Yellowstone and circling down to West Yellowstone. Towing thru the park is kind of a pain, with that said I did tow from West Yellowstone through the park down the Jackson Hole and that is pretty easy. Coming thru the north entrance at Gardiner, Mo. is really tough unless they have all the construction finished from Mammoth Hot Springs down to the center of Yellowstone. I've been to Yellowstone 3 times spent a total of 19 days in the park and still have not seen every thing to see (but most of it). If this is your first trip I guarantee you will return.
I pulled my old camper a 2010 Eagle Super Lite 30.5 DBSA and the only issue I had was a failed fresh water pump. I always carry a spare so it was a 45 min repair while camped at West Yellowstone. Before I left home I pulled the hubs, replaced the brakes, washed out bearing and greased, checked all the tire pressures (check pressures every time I pull) (my tires were less than 1 year old). If you don't have an aux fuel tank I highly recommend it, saves a lot of time and money. I wish you the best and have a great time, would be nice if you had more time.
2018 Jayco Eagle HT 29.5 FBDS
2010 Jayco Eagle Super Lite 30.5 DBSA (Sold 2018)
1998 HitchHiker II 31 RLBG (Sold 2012)
2002 Ford F350 Crew Cab, DW, (Mint)