When I think about the readers of this site, I realize that there are multiple types of readers. One type is portrayed in the book Nomadland and represented by many videos by Bob Wells; these are people who were forced to be nomads because of financial necessity. Another type is retired workers or seasonal or remote workers who choose to be nomads because it is a lifestyle they embrace and who are not forced by financial necessity into nomadic life. A third type is potential nomads who currently live in a house, apartment, boat or other "permanent" lodging, are "relatively" financial secure (even if only one illness, accident, major house repair, etc could change this) and might like to embrace a nomadic lifestyle (if only to avoid sitting in front of a TV all day or to see the sights of America or the world). I cannot say to which group RonDean belongs.
The types of solutions to the "landing spot" problem may depend on the financial condition of the nomad. For some, living within walking distance of essentially all necessities in a "big" city could be a solution, especially considering the public services (e.g. free senior transportation) available. For others in states with free or inexpensive public transportation services for seniors, living in a rural community within a hour's drive of a big city (with multiple medical providers) might offer a good, inexpensive solution. (In either of these two cases, a group of nomads unable to individually afford a house/apartment might band together and buy/rent a house/apartment.) The above solution of "A little apartment or trailer in town" fits into these categories, as does the statement "... but most towns have services that assist seniors that need help... rides to store and doc, even meals delivered, etc." Senior (transportation) services between rural and nearby urban communities exist in some states. Many "towns" do not offer adequate (or any) hospitals, medical specialists or even very many general practitioners/family doctors. (I have siblings or relatives in California who have had to travel hundreds of miles for dental implants, heart surgery, detached retina surgery, etc. and whose GPs & dentists have moved to larger cities.)
What is a "big enough" city? This depends more on the services offered and less on the size. Rochester, Minnesota (120K) is big enough. My current city has multiple Level I Trauma Centers which serve patients in multiple states and I have never left the city for my (6+) surgeries. If access to advanced medical or dental services is important to a person, researching the available options in a "town" might be wise. The focus of some on living in Arizona, New Mexico, Nevada, etc. and ignoring Illinois, Iowa, Nebraska, Missouri, Kansas, Arkansas, Indiana, etc. might cause other nomads to ignore inexpensive solutions to the "landing problem."