have you tried opening and closing the door to the tent a couple times? Sometimes there are problems between the server and client reconciling the state of doors. I had a friend report that he walked into a tent yesterday, and tried to place a barrel. It appeared outside of the tent. His client was displaying the tent as open, when the server recognized it to be closed.

Ah, great tip, Thanks. We'll try it LYLT

Since the cars have a manual transmission they will move to the lowest point of the area after all players are far away. Tested with all gears.