The Route 66 Casino in Albuquerque, NM no longer is allowing overnight RV Parking in their parking lot. In August 2016, they opened a new RV Park that is adjacent to the casino and require you to use this. It looks like a nice RV Park, with prices as low as $25 (with a specific casino card). Otherwise, the normal price is $50 a night (discounts and lower prices are available).
Previously, we had the Seneca Allegany Casino in Salamanca, NY listed as not allowing overnight RV Parking. However, friends just reported in that overnight RV parking IS allowed, just not in all of the lots. Some parking lots have signs telling you were RV parking isn't allowed.
A website user submitted information on the Lakeside Casino and RV Park, located in Pahrump, NV. This is a very nice looking RV Park. This casino doesn't allow overnight RV Parking except in the RV Park.
Although I just found out, the old "Casino Omaha" in Onawa, Idaho was rebuilt and reopened in 2013. This "new" casino is now called Blackbird Bend Casino. They offer free overnight RV Parking with free electrical hook-ups on a first-come basis.
It's been over 5 years since we've heard any news about Gun Lake Casino in Wayland, MI. Thanks to a website user, we've learned that they now DO allow overnight RV Parking.
Another Isle of Capri Casino has been added to the website. This one is located in Lula, MS. They do allow Overnight RV Parking, for a small fee. But you do get full hook-ups.