I've thought about fortifying the under seat battery box of my defender (steel plate lid with heavy duty lock) and then fitting an isolator inside (to save disconnecting the +ve terminal) - has anyone done this?
That doesnt really help because both the +ve and -Ve cables run out of the seat box underneath the landy so laying on your back under the landy you can cut both cables. Therefore doing exactly the same as you would be disconnecting the battery