They have plenty of room for any size rig, and security told me we were welcome to park there for 2 or 3 nights if we’d like. RV parking in a large open parking area.
Note that you’ll need something to drive from here to anywhere else in the city, because it’s not walking distance. There’s a Hilton Garden hotel on the property, and several restaurants including a Houlihans. The casino has 1000 slot machines, Las Vegas style table games, and of course the dog racing if you get into that.