[The KG9 Kid]

Toyota has been rumored in recent years to be looking at putting their Hino turbo diesel in a one-ton 'Tundra HD 2500'. They even did a mock-up of it at a trade show:

Hino Motors is Toyota's industrial truck divison. They make the Aisin transmission that the high end Dodge Ram 3500 Cummins HO (6.7l inline six: 385hp, 865ft/lb torque) uses.

Toyota basically has a Cummins-level prime mover engine/drivetrain combo that could tow even the biggest and heaviest fifth wheel toy hauler: 32,000 GVWT. That's 16 tons towing capability. The wicked Cummins HO only supports 15 tons and anyone who needs that kind of towing capability is like a hero to me. That's just SICK towing capability.

They just need to put that Hino mill in a Tundra that has a chassis can handle a military-marine grade drivetrain. If they do, they'll sell every one they make.

(Side note: Most powerful engine I've seen on the road was a Volvo D13 inside a two million dollar Prevost luxury coach that had some 1600+ ft/lb of torque and was towing a 30-foot trailer behind his 40 foot RV. Jeeminy jumpin' jehosephat, and it even got 9 mpg with a range of more than 1000 miles. Just absurd power: 13 liters of howling turbo diesel.)

[Bulwyf]

They need to steer clear of Cummins, they’ve rode their rep too long. They don’t hold up to Duramax.

That mockup sure looks good though, however if it’s a 2500, it’ll be 3/4 ton. That one looks like a dually, so that would most likely be a full one ton.