Lockers, lockers, lockers. We keep pounding into your brain that you must have one if out on the trails. Have you ever commuted to work with a locker clunking and clanging under your rig? A locker that can be turned off, such as this ARB Air Locker, will make a much better choice for a vehicle that puts a lot of pavement under its tires. If moderate trails are more your flavor, then a limited-slip will work fine.