Can players steal my horse / minicopter / boat?
If you bought a vanilla one through traditional means (scrap from Bandit Camp or Fishing village etc.) then it can be stolen, these are purely vanilla 'vehicles' we do not alter or control.
This is against our rules, if you see a player doing so get us a recording and submit it to our support ticket system. We will deal with that player. If you received the vehicle through /license then no, players cannot steal them or access their inventory.