We were there this past September and there is RV parking. I saw a number of tour buses and several RV's in the lot. I am sure it will fill quickly during that time. You will enjoy the visit. While I had seen photos of Mt. Rushmore all my life, I was still impressed by the real thing up close.
2007 Country Coach Allure Siskiyou Summit, sold/traded Nov. 2018.
2019 Grand Designs 384GK-R 5th wheel. Glen Allen, VA