The gravel lot behind the Shell station is no longer available. Construction of some sort has just started. There is about six slots at the east end of casino, last drive entrance, but the are slopped fairly good. I found it best to drive around the first entrance then behind the hotel into the lot. Was able to get level enough, front end off ground. Talked to security and the stay limit hasn't changed, three days but if your leaving plenty of money they will happily extend your stay. No registration needed.
Casino is very nice. The band has done a great job for RV ers wanting to park overnight. There is a large ( not huge wasteland ) paved area right behind the casino. Well lit, cameras, accessible. The lot is sloped somewhat for the bigger units stalls but plenty of level stalls for smaller units. In addition, behind the Shell gas station / info centre, there are additional stalls (level gravel lot )- some road noise that is minimal on hwy 101 at night ! This lot also is well lit and has security cameras.
Definitely RV overnight friendly.