I agree with Van Tramp about the Fraternal Organizations being in dire need of membership. Problem is that going to Lodge meetings doesn't translate into too many younger people's idea of life.
I'm an Elk and Free Mason and can tell you of the difficulties. We just sold the Lodge building in my home town which was nearing 120 years of age. Many wanted to keep it but it had just grown to be a money pit. (in a part of town that was potentially dangerous after dark) It is integrated now so anyone who wants can be a member can if they pass investigation. Free Masons in Ohio have held what are called "One day Classes where for several hundred dollars you sit and watched reenactments of each degree and you could be a 32 degree Scottish Rite Mason. That's how hard up some Fraternal organizations are now days when so many younger people just don't see how it translated to their kind of life. It's like they feel that this is for old men who are military veterans, alcohol consumers, politicians, sales types hunting for customers, and they just don't relate to those types of people. It's like these places are fountains of youth for old people. These young people would rather stay home and socialize via the internet.
Some of these Lodges have good leadership (main thing to look for before joining) where the lodge thrives and grows. New ideas are welcome. One of those ideas has been to find places in shopping centers with Grocery Stores, Discount Stores, Barber Shops, Beauty Salons, Insurance Agencies, Discount Stores, Restaurants, Auto Service Centers etc. Here you have a large parking lot with plenty of space. The Lodge is one floor so access is assured. These Lodges are set up with restaurant and tavern so food is available there at reasonable prices. In my area the Moose Lodge has set a great example for this. Many Fraternal Lodge members belong to more than one Lodge so as they travel they can avail themselves of a safe place to park at night while visiting the lodge. Some have separate buildings with parking lots and have gone the distance to accommodate RV's with traveling members. They have Sewage Dump and hitching post with electric and WIFI for a set fee each night. They could also come into the Lodge and enjoy the company of members, have drinks/food and interact with others. This may hold more appeal to older folks.
Younger people may just choose the National syndicates of Gym's like Planet Fitness.
But it's a way of having some social life while on the road for those who are more sociable.
What I'm finding in my Lodge is that there are many "old school" older members to whom new ideas don't come to easily. They cannot wrap their minds around making our new lodge accommodating to RV traveling members who are recently retired and wanting now to see America. They are still thinking Flag Day, public speeches, Parades, Volunteering Lodge Members at VA Hospitals, and community outreach. They don't realize the economic gains that could come from catering to traveling members.
Want to suggest ideas about RVing Members or those interesting becoming a member while on the road:
Moose International
https://www.mooseintl.org/
Elks USA org
https://www.elks.org/elksmag/contact.cfm
Fraternal Order of Eagles
https://www.foe.com/
International Order of Odd Fellows
http://www.ioof.org/
Masonic Service Association of North America
http://www.msana.com/
Each of these websites has "contact information" listed in them. If you wish to email them expressing interest in being a member who travels in an RV and would like to know more about Lodges with facilities for RV/overnight parking facilities, the addresses are available at these links. They are always claiming to be looking for new ideas that could grow membership and ways of bringing money into the Lodges.