One of the new Week 9 Challenges in Fortnite requires you to use a Shopping Cart. There is a perfect spot that always has multiple shopping carts and makes this challenge very easy.
South of Pleasant Park is a small mountain that always spawn a couple of shopping carts. Simply land there when the match starts and ride a shopping cart down the hill on one of the ramps.
ALL WEEK 9 CHALLENGES (Fortnite Battle Royal)
Deal damage with Explosive Weapons to opponents (0/500)
Search Chests in Moisty Mire (0/7)
Use a Shopping Cart (0/1)
Visit the centre of Named locations in a single match (0/4)
Follow the treasure map found in Haunted Hills – HARD (0/1)
Shotgun Eliminations – HARD (0/4)
Eliminate opponents in Anarchy Acres – HARD (0/3)