/trust [playerID] [spawncode] = Trust the specified player to your vehicle if you own it.
/untrust [playerID] [spawncode] = Opposite of /trust... Lol..
/vehicles = List the vehicles you have access to utilize
/setOwner [playerID] [spawncode] = Set the owner of a personal vehicle
/clear [spawncode] = Gets rid of all the specified vehicle's data in case you messed up setOwner