https://www.gamespot.com/articles/fortnite-road-trip-skin-the-mysterious-reward-is-f/1100-6461391/

Alongside the Ragnarok skin available for reaching Battle Pass level 100, the other big chase during Season 5 of Fortnite: Battle Royale has been an until-now secret outfit. With a sufficient number of Road Trip challenges now available, the first players have unlocked the accompanying Legendary-tier skin, which we now know is called Enforcer.