Overnight RV Parking may be OK for small RVs - see notes and reports, look at Google satellite view. Call casino to inquire about overnight parking. Note latest reviews - there seems to have been a camping area added
Golden Buffalo Casino & Hotel
RV Parking and Camping Information
I have a 21 ft. rv, no problem in parking on their lot. In fact I was able to park right next to casino bldg. in their handicap spot.
They serve a great prime rib, reduced price if points are earned on players card. This place isn't fancy, but enjoyable and people are friendly.