Hi folks, I was at the Libyan deserts this winter. I also drive Def 110 300tdi. To be honest, I would never take 7.5 16 with me on such trip unless I want spend most of time with the shovel  No local trucks used 7.5 at the desert either. Some farmers used those on the hard surface roads though. Same diameter as 7.5 will have 235/85 but will be slightly wider. One of our cars used 235/85 and did ok although the driver had heavy foot.
Perhaps it is a surprise but my 255/85 BFG MT (not AT) did just fine after going down to 1 atm and using some momentum. My colleagues used 265/75 or 285/75 x 16 and those worked even better. As to the risk to your CV or halfshafts, I solved it by installing upgraded CV/shafts from Ashcroft transmissions.
Cheers
Jarek
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