The new vehicle system is bugged, and I hope developers will take a look at this ASAP:
https://www.youtube.com/watch?v=aOZ5sWE92jc&feature=youtu.beNotice how my car despawns when Volt (or anyone else) types !Getcar, and probably the reason is the server assigns the same IDs to our cars (mine is destroyed on his !getcar, his on mine, because we're using the same ID, but why?)