Exactly. The LX570 is even heavier than the LC at over 6000#'s Add in aggressive gears, full time 4wd and 400lb-ft of torque and they dont last. Plus, I think Toyota went a bit low on the recommended tire pressure. More comfort but more wear too. The tread wear rating of the factory Dunlops is 360 which is middle of the pack. Compare that to the Duratrac which carries a 500 tread rating and you can see why they wear. Its ride or durability I guess.