We just left Grand Portage Casino in Grand Portage MN. They have a full service RV park with about 30 full hook-up sites, with 50/30, water/sewer. All are on grass/gravel with about half being pull through. A little pricey at $30 a night, but the only place around if visiting Grand Portage area which was a nice stay.
This casino/RV park does not show up on your site.
The casino is all machines, most are slot but several banks of video poker/keno. Not sure what the payout results are, we did not do well in two short stop-bys.
Did get a coupon for a discount breakfast in the resort for signing up for the players club.
Would stay again.