Make sure you have latest MENYOO
https://www.gta5-hub.com/scripts/menyoo-pc-sp

Make sure Vehicle Invincibility(Godmode) is ON

Move the XML Doc. to
Rockstar Games\Grand Theft Auto V\menyooStuff\Vehicle.

How to Spawn???:
Go to Vehicle Option/Vehicle Spawner/Saved Vehicle.

Menyoo Donwload:
https://www.gta5-hub.com/scripts/menyoo-pc-sp