I went for the opposite approach in my heavily loaded LR in Ethiopia. By dropping the tyre pressures, it meant that there was plenty of give in the tyres so they could partially mould over the stones. A Dutch Landrover we were travelling with went for the approach of keeping their tyres pumped high and suffered far more damage to their tyres. Because of the surface, you will get some increased damage either way but I think allowing the tyres to give a bit is far more effective. Given that most of the stones are hardpacked in to the road, I don't believe it is possible for highly pumped tyres to flick the stones out of the way.
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