We did this powerlines route last month and we struggled to find the Limpopo crossing, the coords of the N221 turnoff are S22,470444° E31,511799. It's definitely the better route compared to alternative route along the border cutline. There was both diesel and petrol at the Chiqualaquala Funae fuel stop, they don't take cards but will take Rands.
It took us 6 hours from Pafuri including border posts, I think the Beitbridge option will take about an hour longer.
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