Singleplayer
1. Place a vehicle (here: T100) in the editor.
2. Destroy it.
=> wreck is hull only, turret is missing (proper wreck model)
Multiplayer
1. Place a vehicle (here: T100) in a mission on a server.
2. Destroy it.
=> For server/hosting player: proper model (hull only)
=> For client: Same model as normal vehicle, just with black texture.
3. As client, drive into the destroyed vehicle with another vehicle. The proper wreck model will appear (the turret gets hidden)