I understand that there is a gym and showers that RV overnighters can use for a fee, anyone know anything about this?

No, incorrect. At least not at the Casino they don't.

I have never seen any of that, and I've been there several times recently. Stay in my camper there for 3 days two weeks ago, and all I knew about is the free electrical hookup with validation

Shower yes gym ???

Showers for rv users?? Help me find out z