Found the thread where @LcAz mentioned it fits perfectly: 34x10.5 Toyo AT3 D load?I don't see how it could because the 285/70R18 doesn't fit and that's 33.7" diameter. There is a metal bracket that may have to be modified or maybe it sits at a wonky angle but because of the narrower tire it is not as noticeable as the 285 width. My 285/65R18 was the same diameter as the 265/70R18 tire and fit fine but the wider tire sat lower by about an inch or so.
I really, really wish that Toyota would've kept the barn door with tire carrier like the older LC's, but no, they had to go and make it a hatchbackwith the spare down below. That makes me think they weren't thinking of the Prado/J250 as a heavy duty offroad vehicle or maybe they thought that the rock crawlers would probably have an aftermarket rear bumper with tire carrier. I'll never know though and it is what it is. Still love the truck, 17k miles and no problems thus far.
These tires are actually around 33.5" so somewhat makes sense.