Clearly your truck was abducted by Space Aliens.Expecting to find a limitless supply of Fanta soda (which aliens love by the way), they sadly found none and so returned the power steering fluid and your truck to its parking space.
Ringleader, the aliens obviously don't know Alvin,he's a Pepsi guy!
Joking apart,Alvin I hope you get to the bottom of the problem soon!