I am an Elk, but joined for other reasons than having a parking spot for my RV. This is a perk and only a small part of membership. Our particular lodge at the foot of the Jefferson Barracks Bridge in St Louis offers electric only hookups and is open to the general public, I believe but am not sure, for a small fee.
It is comforting to visit different areas, find a local Lodge and be immediately accepted for casual conservation, a cold beverage and insight to the local happenings, dining, events, sites, etc.
However not all Lodges offer RV parking/hookups and do vary service offered and prices.