I think not. We decided to stay a few more days so we drove across the street to Riverside RV Park and payed five dollars to use their rv dump and fill our fresh water tank.
I have been using the casino restroom during the day to help not fill our waste tank as fast.
Katherine's Landing is located on the Arizona side of the Colorado river seven miles from Laughlin just up lake from Davis Dam. It is part of the Lake Mead National Recreational Area.
Nice campground with no hookups for $10 or $5 for Senior Pass holders. The Senior Pass holders also do not owe the day use charge.
If you enlarge this photo you can see our red Dodge just to the right of the building in the center. We used their laundry and I have taken two showers in their pay shower house. This let us stay longer without dumping.
They have a free dump and water refill but it would cost more than the $5 in diesel I paid across the street to dump.
All this makes staying at Riverside Casino very easy.