The sensor that was where the latch now sits has been removed from mine, and the rest work fine.
Not sure what was done with the wiring, but the sensor is definitely not there - and you can see from the "display" on the touch screen that there is one sensor missing - but the system has worked without problem from the day the wheel carrier was installed.
One thing I have noticed though is that when reversing up to a vertical wall, the warning "beeps" change to a long solid "beeeeeeep" just as the spare wheel hits the wall.

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