The best way to do this one is by replaying the very first level “Yellowbrick Road” (Wizard of Oz).
Make sure you only have one character and a vehicle (does not count as a character) on the pad.
Do not stop for other stuff like minikits; that might prevent you from getting the trophy (I had that problem after using Venkman and the ghost trap).
Now follow the level and after the last part you will have unlocked the trophy.
Make sure not to have any othe character on the pad, take one off, wait a few seconds and place another on the pad.