This script requires his framework which you can find here. So from my understanding he would link vehicles to the current character you are playing as.
When using the framework you can trigger the /changecharacter command to go back to the character selection screen. If you’re using SonoranCAD integration then it will use your characters registered there.
I think you should make an Intergration with Rocket CAD, I think people would die for it, Also maybe Bubble if its possible, Ik it might be hard… Also got a suggestion for you, You should attempt to make your own CAD kinda like senoran and link it to that.