There was nothing a Wigan fire station crew could do to save the Fiat vehicle which was well ablaze when they were called to Molly's fishing lodges off Dartington Road, Spring View, at around 9.25pm on Thursday May 12.
The flames were quickly doused and the matter reported to the police due to the suspicious circumstances.
Anyone with information should ring police on 101 or Crimestoppers on 0800 555111.