[Pottus]

That is because as I mentioned your dynamic system design is poor I've provided you with an example of a dynamic system it doesn't matter what kind of system you make it's almost always the same. However for vehicles there is a small difference you won't need to do any look up for a free slot since creating a vehicle will return the vehicleid which can be used to reference the array index element.

@Edit No it's not for noobs to understand functions its for people to understand how a dynamic system operates which you clearly have an obtuse and obfuscated design ideology.