Hi Mrcrlc,
I know you said you were going south, all our travels have taken us north in WA. A stone guard is very cheap insurance.
I was up near Marble Bar early in Sept last year and a rock blew out the back window on the ranger with a canopy, those things are $1500 dollars to replace. My bother blew his rear window on his challenger, the poor bugger, a wife and 2 kids on board.
They were literally crying tears of mud by the time we all got into Port Headland and then a 3 day wait for a rear window to be flown in!!
We only have CT's but we now invested in stone guards, yes they cost us both over $600 but the inconvenience is just too much.
As one of the other guys said, have a look at the guard after a trip, it ain't pretty and I would like my ct to look nice for a bit longer