Is there a setting that can recall/kill your spawned vehicle when the limiter is set to 1 vehicle at a time?  If not, may I please suggest that ability?

I'm not sure what you mean.
"Limit the number of vehicles at a time": 1,//You set it to 1, right?
If it is 1, you can only spawn one vehicle, not more

Yes if the limiter is set to only allow one vehicle at a time, and you try and call a different type of vehicle the plugin requires you to kill your currently spawned vehicle.  Can the plugin handle killing the currently spawned vehicle for the player if calling a different type of vehicle?  For example the player doesn't have to manually kill the currently spawned vehicle in order to get a new/different type out.