The patents showed it with a seat on top about 6-7 years ago.
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The high battery is probably a good idea if it's not very well sealed. If you haven't seen the news stories out of florida. A number of electric vehicles that were in salt water and ended up with salt being deposited inside the batteries. When the water dries up the salt concentrates and creates a short in the battery. And they are catching on fire. At least a couple of Tesla's and a few others have done that. And it doesn't happen until multiple weeks after the flooding event.
I think this trends to point to the 4Runner having the 3rd row for the USA market.