From MTA DayZ Wikipedia
This tent is filled by heavy military loot (full slots). You can find it only if you have all Artifact parts.
Where to find
This is really special item. You can't find it in any loot point on the server.
|Pitch a tent|| This item can be used by double-click (or via context menu) in Inventory.
|Pick up|| This item can be equipped via context menu in Inventory.