Just a note of caution, having run 80" centres. In order to legally drive at >32 kph on the road, you have to be narrower than 2.55m. A tractor on 2m plus 650 tyres is over that limit. .Gov link
Nothing to stop you having wider centres on row crops than on your normal full width tyres though.
72" seems to be very common. It was only the steeper ground at my old place that made most of the locals go to 80".
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