If you plan on doing this soon, be aware that snow is predicted for this coming week, and not just in the mountains. May mean an early cold winter or may not.
The National Parks are Yellowstone/Tetons, Fossil Butte and Devil's Tower. YNP is obviously the big one. Getting a campsite inside the park requires very early reservations. Camping outside the park will add many miles to the already long drives you'll have in the park. The park is one quarter the size of Maryland.
BK
Arctic Fox 25Y Travel Trailer
2018 RAM 2500 6.7L 4WD shortbed
Straightline dual cam hitch
400W Solar with Victron controller
Superbumper