Finally had the chance to pull off the bullbar and figure out what's going on with my Park Assist sensors. Plugged in the trusty Snap-On diagnostic tool and found that 4 of the sensors were shorting. Swapped them around and isolated which ones were busted. So the idiots in Alice Springs who installed the bar broke 4 of the sensors and they now need replacing at $211 each. Suffice to say there is a strongly-worded email in the making. In the meantime my Jeep looks like this:
Also, I sent my new 18" wheels up to Darwin to have Hankook RF10 LT275/65R18 tyres fitted. Finally going to have AT's.