Hello I'd like to inquire about how is it possible to make some vehicles more than 1000 HP or make them much more durable like armored vehicles.

basically, you just set all occupied vehicles' health to 1000 on every server tick and handle health yourself using a variable and devise your own rules for how this behaves. and when your own rules want to make the vehicle destroyed, you just set the health to zero and let normal San Andreas game rules handle the rest