After seeing this thread, I checked my Land Cruiser First Edition fuel filler door hinge.
Exactly the same rust!
Seems like we should all make a concerted effort to advise our Lexus/Toyota service departments about this at the next visit.
I hope I'm not intruding on the forum, but I recently took delivery of a Land Cruiser First Edition with standard 20" wheels and Michelin LTX Trail tires.
When test driving it before purchasing, I noticed a vibration in the ride at low speed - from very slow up to the about 40 mph maximum speed...