Land Cruisers have proven their offroading capabilities even in competitive environments. But there will always be terrains where other vehicles will outperform it. Also, as many have mentioned already, person behind the wheel will be a huge factor.
Consider, for the sake of argument, someone from IJC commandeering the vehicle, and we have a good chance that we will reach our destination. Now consider Toofan monkeying around and we may have the vehicle upside down within the first 10 feet of travel.