The new Range Rover platform is very capable off road (first hand experience) and it will have no problem completing this journey.
Sure its not quite the same as the clanky old classics doing it back in '91, but in modern day context everything that Land Rover is doing as a car manufacturer is pretty cool. Empty Quarter Crossing with the Sport, Trans America Trail with the LR4, Silk Road with the Range Rover, now Great Divide with the Range Rover...
Agree or disagree with the design of the current vehicles, that is an impressive list of achievements (especially considering it has all been within the last 12 months.
For years Land Rover enthusiasts asked for the brand to return to its roots - is this not a representation of that?