does that mean i can have an unlimited amount of caravans?or just one?
theoretically unlimited.
But, where do you buy thoses caravanes and brahmin?
You can buy carts from Paul in NCR (in the bazaar, where your car would park in the fallout 2 game). Talk to him with enough caps in your inventory and one brahmin (to pull the cart) following you and you'll be able to buy a cart. The cart will spawn right after that behind Paul's shop, and you'll have a key in your inventory. Be careful of players near by that might try to steal your key or lockpick your caravan cart and vanish into the wasteland.Alternatively you can go to Junktown and talk to John Boy to buy or sell a cart. John Boy is located left of Darkwaters General Store.
But how Brahmin can carry so much?It should be more less than that :/