I can't get it to work at all!
I first tried using it at Midnight Falls, and my Sim was forced to change his lifetime wish because it won't work as a rabbit hole! I then tried making Sunny Valley and putting a caravan in it, but it won't let me place one either!
I use a couple of Nraas mods, but I checked around and no one else that uses the same mods I do seem to be having the same issue...infact, no one seems to be having the same issues at all! All the other rabbitholes are working perfectly, it's only the caravan, so I'm really confused and kinda frustrated.

Has anyone else have this issue, and does anyone know how I can fix it?

you said that you have some Nraas mods , im sure you have master controller (MC) , did try to rest the Carvan lot?

Look at this thread: http://www.modthesims.info/showthread.php?t=486886

Maybe it can help you.

MasterController in the one Nraas Mod I don't have.

I'm looking at it, thanks :3 I may try moving the caravan idea...

Update:
Nothing I've tried has worked
It's still unselectable
I still can't get a job
And any lifetime wish involving the caravan is still cancled