Thanks for all of the replies, but most of you were no help at all!
Here is the text exchange before the vehicle was towed:
Me: Maybe the brakes?
Wife: Is break fluid smelly?
Me: I don’t know. Never heard of break fluid.
Wife: Ha ha. Brake.
Me: Yes. It can smell fishy.
Wife: This smells like ass.
Me: Please have the tech call me before we go chasing big money items.
Well, we spent no money. What I did prove is that my wife has a good nose and SWUtah knows women (“When you’re not driving it you never know what women run over”). It appears some unfortunate animal took refuge somewhere in the drivetrain or made a poor decision getting in front of the Land Cruiser. The Toyota service department agreed it “smelled like ass.”
Thanks again, everyone.