I struggled a bit with the plastic vs. metal debate. I went with plastic for several reasons. Firstly, Bestop doesn't make an instatrunk for the LJ and the Tuffy Enclosure I looked at weighed 92 lbs. My plastic one weighs 15-20 lbs. I'd love to save weight with an aluminum cover but I can't stand the look of diamond plate. Secondly, all the metal solution's I looked at were WAY more expensive. For example, Tuffy cost $517 and plastic was $200. Thirdly, the crime rate in my area is basically non-existent. Fourthly, if I REALLY need to secure anything, I can always attach a metal tool box to the floor (under the tonneau).