the Hino engines would be a true medium duty work engine, I can't knock that - and frankly I don't have enough knowledge about either of them to compare them to cummins, the Hino 6 cyl is a similar design to the cummins, Common rail, 6 cyl inline, loads of torque - but honestly from the spec's it seems pretty under powered... 8L of diesel 6cyl lovin and it only produces 220hp and 520ft/lb - I'm sure it could be tuned for a fair bit more though...
So far you're the only rational argument for a decent diesel offering in a toyota truck
- the fact still remains though that they are looking using the 4.5L twin turbo...
I also don't think any of the daihatsu engines are an option as it appears 16L is the low end, lol
perhaps a 4L 1 cylinder model?
-Z