@thegoldsmith @FishW it could be a unit thing you bring your llama caravan and place it in a unit and the unit is locked with redstone pistons or something similar and you could be given a specific item to act as a key so you can get your llamas later

Thats a good idea! Then maybe like you have one hour of time or such. And if you don't return the gates are opened so no one can just take over all the stalls. And maybe you pay a small fee to use it too.