I have to be honest once I saw "Advanced Vehicle System" I expected a support addon which allows car makers to add new features on their cars.
I'd suggest changing the name.
It was called "No Vehicle Limit" before release but I was afraid Baspot would fail the add-on based on a prejudice, now that it's released and has some downloads it would be a bad idea to change the name.
So if a player gets out of radius of a vehicle it despawns and respawns when a player comes next to it.
But does it save the position of the vehicle?
Nope, the vehicle is re-spawned at its spawn brick. Re-spawning it at its deleted location is not feasible.