Last para. from an article in the AFR may hold the clue to todays meteoric rise:
"AHG also runs a refrigerated storage and transport business that has been an underperformer, with some analysts urging the company to sell the division to become a pure-play automotive dealership firm. The change in chief executive and the fresh set of eyes coming in may hasten a sell-off, but the company won't say if it will pursue such a course"