The Range Rover thing came about when they were the only 'comfortable' 4WD's on the road (the other being an army style jeep) and were called Toorak Tractors. Nowdays, every third car on the road is a 4WD.
The Snow thing came about because of the Couldabeen's.
The snob thing was MCC member related, and there probably are some, but the irony is membership is open to anyone.
Cheeseboards are fairly recent and was a deliberate p155 take by the media to suit our perceived style.
I don't really care. Better to have a stereotype than not have one.