GTV
SILVER Star
The "off the shelf tanks" are mostly manufactured in Australia. The VVT-i 2UZ-FE was never sold there. The fuel/evap system is different than our pre-2006. Not even the larger 40 gallon main tank is compatible. Might be possible to adapt but nobody has figured it out yet.
LRA is right down the road from me. I stopped by a few weeks ago and had a chat about it. There are some physical differences in the main tanks which doesn't sound too concerning to me and I'm optimistic that there wouldn't be evaporator issues to contend with just the larger main tank. They said they would sell me a tank but with no guarantee that it would work as designed.