On the 101, which had locks you couldn't lock from the outside :roll: , I put a padlock & hasp on each of the front doors. To be fair, with the fittings I used you could have drilled out a pair of rivets and got in within a few seconds. However, because it LOOKED like it was very secure, people often commented on it.
I was going to make a comment about how easy it is to get into a certain model of 4x4 using basically any piece of metal, but given this is a public forum I'm not going to.