If you are talking about a gypsy caravan, it will only be avaliable in The Sims 3 Supernatural. However, if you just want a caravan-shaped house, you can build it. Note that you cannot build 'real' caravans - those that can move.
no, you do not need your Sims 3 disk, but you will need the disk for the expansion pack you want to install.
There are no mermaids in any of the Sims games or expansion packs.
No you need the University expansion pack.
No, you need the university expansion pack to make zombie Sims.
The first expansion pack released was University.
It's a Sims 2 expansion pack so you need Sims 2.
you need the pet expansion pack
no, you do not need your Sims 3 disk, but you will need the disk for the expansion pack you want to install.
No you can't you need the expansion pack to play it.
You need the expansion pack Late Night to create a six-pack for your Sims.
Well you can't just have sims 2 expansion pack, you have to have the original Sims 2 before you can play and expansion pack
You need to have Sims3 installed on your computer in order the be able to use ANY expansion packs.
Yes
There are no mermaids in any of the Sims games or expansion packs.
No you can't, you need the disk of the expansion pack to play the game.
you get it on Late Night expansion pack
I believe you can play Sims Castaway Stories without having to download the Sims 2 Castaway expansion pack.