Using a Truck as a Human-Powered Tug: Creativity, Load Dynamics, and Field Curiosity

[MikePhua]

Introduction to Improvised Truck Pulling Events
In a blend of athletic spectacle and mechanical curiosity, some communities have repurposed heavy-duty trucks as resistance loads for human-powered pulling events. These exhibitions—often held at athletic clubs or community fairs—challenge teams to manually pull a parked truck across a short distance, testing coordination, strength, and traction. While not a conventional use of commercial vehicles, such events highlight the interplay between static load resistance and human effort.
Terminology Clarified

• Tilt Bed Truck: A truck with a hydraulically tilting flatbed, often used for loading equipment like dozers or skid steers.
  
• Squat: The compression of a truck’s suspension under load, especially visible at the rear axle when weight is added.
  
• D4 Dozer: A mid-sized Caterpillar bulldozer weighing approximately 17,000 lbs, often used in grading and land clearing.
  
• Driver Tires: The powered wheels of a truck, typically located on the rear axle in tandem configurations.
  

The Setup: Athletic Club Truck Pull
In one notable example, a truck owner lent his tilt-bed Kenworth to a local athletic club for a weekend event. The club used the truck as a stationary load for a human-powered pull. Once the initial inertia was overcome, the truck moved smoothly—suggesting that the rolling resistance was manageable for a coordinated group effort.
Inspired by the success, the owner considered adding a Caterpillar D4 dozer to the bed for the next event, increasing the total load by roughly 17,000 lbs. This raised questions about whether the added weight would cause excessive squat on the drive tires and make the truck too difficult to move.
Load Dynamics and Human Pulling Capacity

• Rolling Resistance vs. Static Load
  A truck’s resistance to movement depends more on rolling friction than total weight. Once the tires begin to roll, even heavy loads can be moved with sufficient force.
  
• Squat and Traction
  Adding a dozer increases rear axle compression, which may improve traction but also risks overloading suspension components.
  
• Human Pulling Force
  Teams of trained athletes can generate impressive force. For example, in strongman competitions, groups have pulled fire trucks and aircraft over short distances.
  

Field Anecdote: The Ontario Tractor Pull
In Dunnville, Ontario, a farmer once staged a similar event using a loaded flatbed with drainage equipment. The local high school wrestling team managed to pull the truck 30 feet across gravel. The key was synchronized effort and a gradual build-up of tension before the initial tug. The event became an annual tradition, with different loads added each year—including a vintage grader.
Best Practices for Safe and Effective Truck Pulls

• Use Level, Hard-Packed Surfaces
  Asphalt or concrete minimizes rolling resistance and reduces the risk of tire drag.
  
• Distribute Weight Evenly
  Ensure the load is centered on the bed to prevent axle overload or tipping.
  
• Inspect Suspension and Tires
  Verify that the truck can safely handle the added weight without structural damage.
  
• Use Safety Harnesses and Spotters
  Prevent injuries by coordinating pulls with trained personnel and emergency protocols.
  
• Limit Pull Distance
  Short pulls (20–50 feet) reduce strain and allow for better crowd engagement.
  

Historical Context: Trucks in Strength Exhibitions
Using trucks in strength demonstrations dates back to the mid-20th century, when circus performers and strongmen pulled vehicles to showcase raw power. In modern times, these events have evolved into team-based challenges, often used to raise funds or promote fitness. The combination of industrial machinery and human effort creates a compelling visual and emotional experience.
Case Study: Fundraiser in Bakersfield, California
An oilfield contractor in Bakersfield donated his Kenworth tilt-bed for a local fundraiser. The event featured firefighters, athletes, and community volunteers pulling the truck across a parking lot. The spectacle drew media attention and raised thousands for youth programs. The contractor later added a small excavator to the bed for the next event, increasing the challenge and excitement.
News Spotlight: Engineering Students Explore Load Physics
In 2025, a group of engineering students at a university in Texas analyzed the physics of human-powered truck pulls. Their study modeled friction coefficients, tire deformation, and force vectors. They concluded that with proper surface conditions and team coordination, even trucks with moderate loads could be moved safely. Their findings were published in a journal on applied mechanics and inspired similar events across campus.
Conclusion
Using a truck as a human-powered load is a creative and engaging way to blend mechanical engineering with athletic performance. While unconventional, these events offer insight into load dynamics, traction, and community spirit. Whether pulling an empty tilt-bed or one loaded with a D4 dozer, the key lies in preparation, safety, and a shared sense of challenge. In the world of heavy equipment, sometimes the most memorable moments come not from horsepower—but from human power.