That is an interesting premise, and I too would like to check out the answers you are given here, though I haven’t got that far a long in UE4 myself to be testing multiplayer things to offer you enough of a solution to this problem. I suppose it is just a matter of getting the player inside the space you want them in and have some kind of collision for the floor and walls or else they pass right through right? And it wouldn’t be a possession I suppose as you would not be controlling said vehicle just existing inside it freely.