The Road Trip challenges have replaced the Blockbuster challenges from Season 4, but is essentially the same as they both have new loading screens that unlock from completing each challenge. To complete a Road Trip challenge, players need to complete all seven challenges for the week. The loading screens contain a hidden Battle Star, that hints at where you can find the star in the Fortnite map. The star will only be visible to players that have unlocked the loading screen. Players will simply have to interact with the star to be awarded with a full tier.
Here is the third loading screen that is unlocked:
If you look closely at the image, you will see that the Battle Star is actually hidden on the license plate of the Golf Cart, as shown below:
If you look at the whole license plate, it says J2 (Battle Star) SW. The Battle Star for this week is located south-west of the J2 square on the Fortnite map. Most of the J2 square is in the sea, so it should not be that difficult to find the star, but we have highlighted the exact location below:
Here is a video showing the location of the hidden Battle Star: