The best defense is not to get lazy and leave the empeg in there. it's hard and inconvient sometimes, but it's worth it.

At least lock it in the glove compartment (after getting a secure aftermarket glove compartment

I don't have an alarm on my jeep and I leave the top off most of the year, so I almost always take it with me. Sometime I leave it in the strongbox in the jeep, but only when I go to certain clubs.

I admit, a couple of times dudes and girls wyho thought they were so cool made fun of me or were amazed at the retro "Benzi Box" i was carrying. They thought I was going to jump into a Datzun Z-28 or something.