They 2 parks, one on the east side of the round about, very large, lots of spaces.
Over in the casino parking lot, north of the truck parking is the original RV spots
I think it cost about $30 a night in either park. With a players card you get a free night for new members, I think. We stay there 4-5 times a year, and haven't paid in years. You pull into an empty spot, set up, then go register in the casino gift shop if your in the main lot, or check in at the service plaza if your in the off site lot
2021 Ram Limited, 3500, Crew Cab, 1075FTPD of Torque!, Max Tow, Long bed, 4 x 4, Dually,
2006 40' Landmark Mt. Rushmore