Several passengers suffered minor injuries and shock, one passenger in the most vulnerable seat was taken to hospital by ambulance.
Jersey Fire and Rescue say the impact was sufficient to peel back a portion of the vehicles roof to the first row of seating which were occupied.
The weekend event coincides with International Pride Month and the 51st anniversary of the Stonewall riots.
The scheme has been backed by the island's Lieutenant-Governor, and is the first of its kind in the Channel Islands.
Sunny spells and isolated light showers. After dusk fair spells with isolated showers.