Boomtown Casino in Biloxi, MS recently converted the parking lot across the street into a proper RV park with full hookups, nice level concrete pads (both pull through and back in). This park was just opened less than two weeks ago.
We just spent one night here so my wife could get her gambling fix. LOL She booked it on the phone and check in was also done on the phone when we got here. A security car drives through every little while 7x24 and all the Boomtown staff we have dealt with have been super nice and friendly. They seem to go out of their way to be helpful, too. While it is easy walking distance to and from the park all one need do is call them and a shuttle will come pick us up. It has free Wifi, but it did not work very well for us. I think they are still debugging a few issues, like their security lighting and the wifi. The IP casino is also very close by.
The cost was a bit high I think at $40 a night, but my wife won that back at the slots. :-). We also enjoyed a very reasonably ($14.50 each) priced and excellent buffet dinner at Boomtown.
All-in-all, I guess it's a good place to camp if you want to hit the tables or slots in Biloxi. ;-)