19/06/2025
If you caught the May/June issue of Wheels of Time, you already know the truckâand if you made it to the ATHS National Convention in Madison, you got to see it in person. But for Craig Cox Jr., that 1959 Diamond T 923 isnât just a showpiece. Itâs a rolling slice of historyâand still very much a working truck.
âYou donât see them on the road like you do a Peterbilt or a Kenworth. Itâs a breed of its own,â Craig says. âYou pull up to a truck stop, and people either donât know what it is, or they tell you a story about one they or their family member used to drive.â
This story started decades ago, when Craigâs uncle, longtime truck mechanic Nate Kenworthy, found the truck on eBay. Once a single-axle dump truck at a Minnesota iron mine, the 923 was built for torque, not speed, with a Cummins 190 and a 5-speed Spicer. Nate gave it a full frame-off restoration, eventually swapping in a Cummins 250 from Fort McCoy and pairing it with a 9-speed Eaton-Fuller. Still, it tops out at 55 mphâsomething Craig jokingly calls âthe sweet spot.â
When Nate retired, Craig stepped inâand got to work. First, he built a steel-pipe brush guard to protect the irreplaceable aluminum radiator. Then came the sun visor (from a 1965 Autocar cement truck), followed by a one-of-a-kind metal sign headliner crafted from discarded Wisconsin road signsâincluding a historical marker, naturally. Behind the seat? More signs, flipped for a clean, bare-metal look.
Mechanically, Craigâs gone over just about everythingâslack adjusters, brakes, bearings, wiring, air and fuel systems, you name it. He even upgraded the exhaust system for that deep, throaty sound that always turns heads. It doesnât have a Jake, but it doesnât need one to make an impression.
And no truck is complete without a trailer. Craig found the perfect match in a 1985 45-foot Old Milwaukee Dorsey beer trailer, straight off Facebook Marketplace. After 16 years in storage, it was pristineâno rust, no fade. He converted it into a mobile lounge, complete with a futon, cafeteria table, pizza oven, and even a vintage school phone booth. The lockers? Salvaged from Wisconsin Dells. The character? All original.
âPeople offer me double what I paid for it,â he says. âBut itâs too cool to part with.â
Craig and his four sonsâJames, Bristol, Matthew, and Jacobârun the familyâs landscaping and lawn care business, Craig and Sons LLC, using the 923 and trailer for hauling brush, hay, and equipment. âItâs in work clothes,â Craig says. âEvery dent, every scratchâthereâs a story behind it.â
Heâs now the VP of the ATHS Southern Wisconsin chapter and also a member of the Beer City chapter. And yes, heâs already planning to bring the truck and trailer setup back to Madison in 2025.
âItâs got trucking history, beer historyâitâs got Wisconsin history,â Craig says. And most of all, itâs still out on the road, making memories.
đ Want the full story?
Check out the latest issue of Wheels of Time to read the complete feature on Craig Cox Jr. and his unforgettable Diamond T. Youâll need to be a member to get the magazineâbut nowâs the perfect time to join ATHS and dive into the history, the people, and the trucks that built America.
đ Join today: aths.org/membership/benefits/wheels-of-time