These bull bars bring back some memories.
A mate of mine had one of those oversize 5 posters on his VU SS, he was travelling out west one evening when he smacked a big red roo fair in the middle of the bar.
The bar held up no worries, the only problem was when the roo got wedged under the front of the bull bar, lifting the front wheels of the ground and rendering his steering useless.
This sent him off the road into a paddock through a barb wire fence.