
This is just another suggestion on how on how to solved the exploit.
Any part or frame that has 0 durability or HP, unable to collide with external object.
Example, the big boulder will be collide with the 1st row frame.
Since the frame has 0 durability, it will simply went through the 1st row frame and collide with the 2nd row frame that has >0 durability.
This will simply solved the invincible car exploit.
Another thing you can look at is the connectivity for the electricity and fuel.
Example,
the fuel tank and the storage battery are install at 3rd row,
the 2nd row has the engine and the electric motor.
Since the link between 2nd and 3rd row, the 1st row is totally destroy, there will no fuel or electric supplied to those motor and engine.