This recently renovated casino offers 8-10 RV spots with water and electric hookups (no sewer). It is free to stay here if you sign up for their free players club inside the casino. There is no minimum spend. I imagine you could park elsewhere in the parking lot without hookups as well, but I didn't specifically ask about that. 

The lot has lots of security cameras so we felt very safe. We opted to get a takeout dinner from the restaurant one night which was good. The bathrooms in the Casino are available for use, but there are no showers.

We stayed for a few days and had a great experience. The RV spots are on the far end of a giant parking lot, and it was surprisingly quiet. 

The only downside is the lot has a pretty substantial slant for drainage, so the spots are not level. You will need at least a couple blocks to get level. We saw multiple big class A's with landing gear extended so far that one of the tires was off the ground. Other than that this was a great free spot for a few days.