Well I think he is right in the way he has reported.
The Jeep would be better, just like a Defender 90 would. Or any lighter 4x4 with lower ground pressure.
A 90 is 1000kg(ish) less than a FFRR and many people run 265/75R16 All-Terrains that go on desert trips I've seen. Much less weight and wider tyres will always be better in sand than a bit of electronic trickery. Particularly as a 265/75R16 can be aired down giving a noticably bigger footprint. Where a low profile FFRR tyre does not deform so much under low pressure you probably have something approaching 50% to 100% more pressure per square cm on the sand in the FFRR.
Maybe you can get a set of smaller alloys (R18?) for your FFRR to help as you'll need more sidewall to get the bigger footprint when you deflate the tyres?
Unless it has big brakes, in which case I can't see an option.
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