According to Fox, this shock will fit on a 2018 Limited just fine as long as it's not fitted with X-REAS. Unfortunately, a lot of Limiteds did have X-REAS, so that's something you'll have to confirm before purchasing. As far as "best" choice, that entirely depends on what you're doing with your 4Runner. The Fox 2.0s are a pretty generalist shock and offer good on-road ride quality while improving handling and off-road capability. However, they won't let you rip through desert at 70mph and they're not the absolute softest rear shock out there. They are a great choice for a street-driven truck that sees some amount of off-road use.