Wednesday, February 8, 2023


Go big or go home; Hennessey Performance begins making monster 500K truck

Nearly two years after it was unveiled, Hennessey Performance has started making the Mammoth 1000 6×6 TRX. It’s the largest and most expensive truck made in the company’s 30-year history.

Announced in April 2022, the Texas-based manufacturer will yearly produce 12 of the monstrous six-wheelers with an equally hefty starting price, $449,950. The total production run will be limited to 200.

Hennessy has started production its new 6x6 monstrous pickup truck.
Hennessy has started production of its new 6×6 monstrous pickup truck.

The Mammoth is based on a 2021 Dodge Ram TRX that has been elevated to a 717 horsepower, supercharged Hellcat V8. It’s been dispatched for a 7.0-liter Hellephant engine with massive 1,026 horsepower. The torque has been increased from 650 to 969 ft lbs. It also has a towing capacity of 7,700 pounds and weighs 6,396 pounds. It can accelerate from 0-to-60 miles per hour in 3.2 seconds.

“Everything we do at Hennessey Performance is turned up to 11, but the Mammoth 1000 6×6 is definitely turned up to 12,” said founder and CEO John Hennessey.

There's plenty of space inside and outside in new Hennessey.
There’s plenty of space inside and outside in the new Hennessey pickup truck.

Hennessey also extended the base by an extra 4 feet and added a third axle to accommodate the additional two wheels. The finished Mammoth is almost 24 feet long, 7 feet high and 7.3 feet wide. The truck is also equipped with an off-road kit, including a locking rear axle, Bilstein suspension and thick 37-inch tires covering 20-inch rims.

Elsewhere are the 6×6 sports uprated front and rear bumpers, along with an array of LED lights to help attract even more attention. Inside, the four-door offers a custom interior to add to the exclusivity. The four-door cabin can be customized by each client.

“Everything on the Mammoth 6×6 is bigger, badder and more imposing—plus, it’s still super-fast, while being a total powerhouse off-road,” said Hennessey. “It’s the undisputed king of the road.”

The Mammoth 1000 6×6 TRX can be ordered now through authorized Ram retailers or directly with Hennessey.

James Raia, a syndicated columnist in Sacramento, California, publishes a free weekly automotive podcast and electronic newsletter. Sign-ups are available on his website, He can be reached via email:



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Dennis Johnson
9 months ago

What a humungous waste of money just for ego massage…..

9 months ago

Stay away from Hennessey. Lots of folks are not happy with their cars from them.

dr. Mike
9 months ago


The Ford F-250, F-350, Ram 2500 and 3500, and the GMC Sierra 2500 and 3500 can all tow 20,000 pounds (37,000 if a gooseneck hitch is used). The “Mammoth 1000 6×6 TRX” has a towing capacity of 7,700 pounds.
As a side note: All of the pick-ups listed are $400,000 less than the Mammoth and all are available today at your local dealership.

9 months ago
Reply to  dr. Mike

7,700 lbs is a laugh but I’m not laughing. My 5.4L 2009 Ford F150 has a towing capacity of 11,000 to 11,300 lbs. Why Mammoth would even bother is beyond reason as this truck would have no useful purpose.

Tommy Molnar
9 months ago

Outside of looking cool in my driveway, I’m not sure what I could use this for . . .

9 months ago
Reply to  Tommy Molnar

I agree.

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