Good answer! Thanks. Yes, I probably will never be taking it in a situation where I'd be putting a high strain on the rear wheels, I hope. This is good to know as this will always live in the back of my mind if we're going camping.
As sad as this is, coming from a car guy, I have yet to crawl under the Highlander so I didn't know that the rear was ONLY electric drive, but that makes sense from an enginering / ease of manufacturing standpoint.
I guess if I need to go extreme, it will be a chance to gas up the '78 F150 4x4