Their strength is incredible indeed. The only load related mishap we had on all the trips was a broken spring leaf (the top main) on a rear wheel. Having no spare, we improvised a fix from tie-down straps and a block of firewood - it held without any further problems for the remaining 2500 kms!
Then again, this load is probably about 400-500 kgs above all recommended maximums, however it is necessary to make it to Uweinat and back. For the first 300 kilometres on asphalt we have to crawl at 50-60 kph with tires pumped up to 55-60 PSI. You go any faster, and the tires start bursting one by one (which at this weight means you've lost a tire completely, the rim cuts through immediately). Once off road though, on the hard flat sand plains, with tires down to 25-30, we can continue with 70-80 without any difficulty.
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