If you go to the Australian Transport Safety Bureaus report this article precis's badky it mentions that it was a passive crossing which due to it's angle didn't conform to the national standards. The angle was such that it was not possible to see the track out the left hand side of the truck cab (ie you would be looking our the rear passenger side window in a car).
In short the angle of the crossing was such that the truck driver couldn't see the train while in the driver's seat no matter how far they leant forward even with the seatbelt off. Unfortunately it was an accident waiting to happen.
A lot of utes and vans have similar vision issues, particularly when loaded so the crossing should have had flashing lights (or been an active crossing). The report states that the driver stopped, looked, couldn't see or hear the train then moved on believing there was no train.