G'day Grey wolf.
Their ain't much that will get through a ROO Bar...
I personally don't have one on my F-Series.
This is the genuine equipment one in Australia (not a bad bar)
http://www.ford.com.au/showroom/acce...94413&model=72
One of the best aftermarket manufacturers makes some really good quality roo bars - just click on the link to bull bars.
http://www.tjmproducts.com.au/master_frameset.asp

My father just bought a diesel Ranger, and it has a pretty good bull bar on it, am hoping to post pics of it shortly.