Zeal on Wheels

By: Darin Burt

Fred Rethwisch is a name quickly becoming synonymous with innovation and dedication in the truck restoration world. His knowledge of vintage trucks, creative talents, and boundless enthusiasm rival that of enthusiasts who’ve spent decades in the hobby. The most surprising part? Fred is only 12 years old.

Fred’s journey into transforming a 1986 International 9670 Cabover is a testament to determination and overcoming expectations. Despite muscular dystrophy (MD) affecting his arms and legs, Fred is deeply involved in every aspect of the restoration, designing much of the plan himself.

“I’ve been around trucks and trucking my whole life.”

Fred took inspiration from his father, Bill, who had rebuilt and customized a 2013 Peterbilt 389 and matching Polar tanker that had already won awards on the truck show circuit. Choosing a cabover model was a personal decision for Fred and a notable departure from the usual fleet of custom Peterbilt 389s at Rethwisch Transport, a petroleum hauler based in Tomah, Wisconsin. After a four-month search, Fred found a truck he liked on Facebook Marketplace. He and his dad flew out the next day, and luckily, the truck was still available.

“I always thought International cabovers were cool. I looked and looked until I found this one, and I fell in love with it,” Fred says.

The restoration process began last December, with a goal to complete it in just five to six months. “The vision came from Fred. We just all worked with him. We were all just subcontractors doing what the general contractor wanted,” Bill explained.

Initially, the truck appeared to be in good condition. However, as Fred and his team began dismantling it, numerous hidden issues emerged. The truck had previously rolled over lightly, leading to extensive Bondo repairs that masked deeper damage. The entire side panel was curved in, and the handlebar mounting area required a makeshift two-by-two plate for support due to the lack of proper mounting space.

Finding replacement panels proved impossible, necessitating a rebuild of many parts from scratch. The front driver’s side corner also showed signs of damage, likely from a flatbed collision.

Fred and his team removed and replaced numerous panels. Customization and chroming were integral parts of the project, featuring dual DynaFlex chrome straight exhaust stacks, custom half fenders, Alcoa small hole aluminum rims, and a 12-gauge steel T-shaped bumper with 11 of Fred’s favorite glass watermelon lights. They also chromed the steps, grill, and many interior pieces for easier maintenance and showtime readiness.

Fred’s ability to weld and grind the truck’s frame while seated on his scooter is truly remarkable, considering his condition. He covers his legs with welding jackets for protection, demonstrating a level of ingenuity and resilience that is inspiring. With the help of a magnetic drill for precise work, Fred ensures that every detail of the truck meets his exacting standards.

Fred’s confidence and knowledge quickly dispelled any doubts vendors had when he contacted them for parts. “We wanted the truck to have a show-quality finish, so we incorporated a lot of chrome and stainless steel. It really makes the truck pop, giving it a sleek, modern look while respecting its roots. I’m pretty picky about my truck. I just want it to be perfect,” Fred explained.

The truck was originally dull black with faded pinstripes, a testament to prolonged sun exposure. Fred opted for a new glossy black and orange theme to give it a unique and striking look. This decision was influenced by his desire to make the truck a standout piece at shows.

One of the biggest challenges was getting the Caterpillar 6NZ single-turbo engine, enhanced by Performance Diesel Inc. (PDI), to work with the 6-speed Allison automatic transmission. The wrong harness prevented proper communication. Luckily PDI had another truck with the same issue, and swapping harnesses solved the problem.

A standout custom feature is the passenger-side fake fuel tank with a sliding shelf, an idea Fred and a friend devised. This modification allows Fred to transport his scooter easily, showcasing his creative problem-solving skills and innovative spirit. Other adaptive modifications to accommodate Fred’s muscular dystrophy include an automatic transmission, disc brakes, and an electronic engine, making it easier for him to drive despite his limited mobility. He handles it like an old pro. “It rides like a brand new truck,” Fred says, noting that the addition of airbags on the back of the cab helps smooth out the bumps.

The response from show attendees has been overwhelmingly positive, with many admiring the meticulous details and custom features. A long list of awards includes Best Exterior, Engine, and Presenter, plus Best of Show and People’s Choice at the DynaFlex Truck in Ventura, California, and Best of Show (Limited Mileage Bobtail) at the prestigious Mid-America Trucking Show (MATS).

Bill has set high standards with his impressive builds, and Fred aims to continue that legacy and create big rigs that make a unique statement. In addition to his own projects, Fred is actively helping his older brother, Luke, restore a 1987 Peterbilt 359. The Rethwisch family’s travels with their truck have taken them across the country, from Reno to Ontario, Canada, to the 2024 ATHS National Convention and Truck Show in York, Pennsylvania.

Closer to home, Fred was invited back to his old elementary school to showcase his truck at a Transportation Day event. Students saw his unique, customized vehicle up close, offering a hands-on learning experience, and demonstrating what a dedicated kid can accomplish.

As the Rethwisch family continues to attend truck shows and participate in ATHS events, they inspire enthusiasts of ALL ages and prove that passion and determination can overcome any challenge. Fred’s story demonstrates the value of perseverance and the pride that goes along with being part of a community that shares a passion for trucks.