I always use wheel locks on my cars/trucks/Jeeps. For the small price of admission, it's worth making it that much harder for some creep to steal your wheels. At the minimum, get one for your spare. Those are just too easy for someone to rip off.
Seeing that you have the optional 18" wheels, I'd definitely get some locks. Jeep owners are usually very hands-off when it comes to other's Jeeps and don't steal off of them, but the new JKs are attracting some owners that haven't been Jeep owners before (see any recent rap videos starring the new Wrangler) so they might not show the same courtesy to your rig as old-time Jeepers would.
Canadian Jeep Club Member #2
2005 Jeep TJ Unlimited
I used to have a Camaro years ago. One night I was parked at a condo clubhouse. The next day I noticed that the plastic caps that go over the lugs were missing from the lugs that were locking. Also the center caps were missing. I think in that instance having the locks kept my rims from getting stolen.
Current: 2005 Wrangler Unlimited - Past: 90 and 92 Trackers and 98 Wrangler SE
There is one Gorilla set with 5 locks. I don't know the part number off hand.
Or just buy a 4 lock set and then when you call Gorilla to order a spare key (You do carry a spare key in your offroad tool bag don't you?) you can order 1 more lock for like 5 bucks. That's what I did last time.
2002 WJ Limited, Stone White, 4.7L H.O., Quadra Drive
OME Springs, MX6 Shocks, BFG 265/70R17 All-Terrain, Level 8 Tracker Wheels