I wouldn't be so quick to doubt Toyota. Whatever they do choose will have at least the durability of the current model. Even if that may be a major architectural change. Just look at IFS... Though I'd speculate that they wouldn't give up the ladder frame as the LC gets seriously used in heavy duty fashion across the world (unlike US), in places like Australia and the middle east. Durability is not a suggestive part of the LC make-up (*cough* Land Rover/Range Rover), it's a core quality of the platform. They have their "soft roader" SUV lines that is separate from their heavier duty lines, e.g. RAV/Highlander vs defunct FJ/4Runner/Prado. I can see a Sequoia go unibody before the LC. Looking at the industry analogues, the just redesigned G-Wagon and Wrangler has stayed body-on-frame.The article says the 300 also gets an all new "chassis" - could that possibly mean a departure from the body-on-frame design that has become a hallmark of the Land Cruiser?
I would think if they move to more "high strength steel" in a similar design would weigh significantly less and be considered "an all new chassis". It'd be nice to drop 500 lbs or so keeping everything else equal (reliability, power, load capacity, comfort, capability).The article says the 300 also gets an all new "chassis" - could that possibly mean a departure from the body-on-frame design that has become a hallmark of the Land Cruiser?