The large senior RV resorts have much to offer retirees, events, hobby shops, sports, and perhaps more importantly, a sense of community. If you haven't already, visit a few of them and stay awhile with your present Airstream. If you like it there, make it your seasonal home.
Used, well-kept park models can be a bargain and are comfortable. Know that there will be annual rent, utilities, and maintenance no matter how much you use it. And that it will lose value, possibly a lot of value.
Owners often want much more than they can really sell for so offer accordingly, especially just before annual rent is due. And as in real estate (although park models are not) location matters; find a nice active park in a nice location, and a convenient and pleasant spot within the park.
The advantage of a larger Airstream is much more comfort over the Bambi (but less than a park model), paying only seasonal rent, and you can move within the park or to another park anytime you want. You can often store it at the park for much less than lot rent.
We also enjoy the parks but use our Airstream to travel about the country extensively on our way to and from these destinations. It's a good life.
The Truth is More Important Than the Facts