I disagree, if you look at Sydney to Melbourne, maybe the window is 50 minutes with 25 at each terminal, and I have never seen a dog at either terminal in action despite working there for a good part of my life ( I am sure they do visit but normally when they have intelligence indicating a need). By comparison, doing the drive, a suspects vehicle will pass through 4 safe t cam sights on their way to Melbourne in NSW alone, they then enter Victoria which has over 100 vehicles capable of doing automatic intelligence checks in seconds. So if you look at the scenario, the risk of detection using a false name at an airport, versus taking a drive in a car that either has real plates and history or false plates that wont last the journey is significantly different.
If you look at the Australian Crime Commission report, Aviation and Maritime sectors are where such activity is high, not road transport:
Crime in the Aviation Sector | Australian Crime Commission.