I've been thinking about this, cause only being able to call one vehicle when you can own so many (especially those of dif. types too) just seems counter-intuitive. However, I think there must be a limit to how many you can select or input to go with the commands. Maybe 3 for land vehicles so /pv 1-3? and /pv 4 and /pv 5 as designated spots for whichever you choose as water and air vehicle, respectively?