Just a rough to show the way I was thinking of going with this. I've distorted the cab with a bend deformer and squashed the wheels and tracks (those damn tracks!!!) with a lattice to get the 'rearing up' look. The dust and the quick motion blur is photoshop at the moment, just to give me an idea of what my final image may look like. Still want to add those cartoon mountains in the background.

Dave: I am still going to give the track tutorial you sent a go, wanted to get this idea out of my head first
mate