Bill -
How many Ford, Dodge, or GM trucks do you see with lift kits and big tires? They don't have the rear end failure issues the Nissan does. I understand how larger wheels/tires can put more strain on the drivetrain, but the rear end would see much greater loads during heavy towing. I don't see how a lift kit would stress the rear end in any way other than possible increased wind resistance. The changes Nissan made are simply band-aids and don't address the root cause which is an inferior rearend.