There was a short-lived rule in September about SN rabbitholes:
For players who are looking to add the Arboretum, Gypsy Wagon and Vault of Antiquity [...] Metro has approved of a player using Edit Town to go to an already zoned lot and placing these items there. [...] Example: In Sunset Valley, you could place the gypsy wagon behind City Hall on it's lot or you could place it at Pinochle Pond.
That's what I did then. In my Appaloosa, I placed Gypsy Wagon on the Equestrian Training Grounds lot, and Vault on the school/stadium lot. Fit like a glove
I played a bit with my dynasty, and then put it on a short hiatus for some reason.
Now i'm back to the game, but it seems to me the rules have changed since then:
If you wish to place the gypsy caravan, or any other rabbit hole from an expansion in your town, you have two choices. If there is not a version of it in the community lot bin, you can save it to the bin from a new unaltered version of the expansion town or you can purchase a property in your dynasty game town and place the rabbit hole via the community objects category in build mode.
I hadn't purchased equestrian grounds or school when I placed rabbitholes back then. I didn't think it was necessary (mainly because of the City Hall example -- obviously, you can't buy a city hall in The Sims).
So, what should I do before returning to play? Is my dynasty failed?