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Professional frame extensions and modifications for commercial vehicles. Enhance capacity and performance with expert solutions.
See Our Work
At 312 Truck, we know that no two fleets are the same, and your vehicles often need to be customized to meet the specific demands of your business. Whether it’s extending the frame of a box truck to increase capacity or modifying a semi-truck to improve performance, our frame extensions and modifications services deliver the solutions you need.
With decades of experience working on commercial vehicles of all sizes, our team is equipped to handle everything from custom frame modifications to structural repairs. We combine advanced techniques, state-of-the-art tools, and the expertise of our skilled technicians to ensure every modification enhances both the functionality and safety of your fleet.
When a vehicle’s frame is customized to fit your unique needs, the result is improved efficiency, functionality, and profitability for your business. Frame extensions are a popular choice for businesses looking to expand the hauling capacity of their vehicles, whether it’s a delivery truck that needs more cargo space or a construction vehicle that needs to support heavier loads. Similarly, frame modifications can help adapt your fleet to changing industry demands, specialized tasks, or compliance requirements.
By investing in professional frame extensions and modifications, you can:
At 312 Truck, every frame extension or modification project begins with a comprehensive consultation to understand your unique requirements. Whether you need to lengthen the wheelbase, alter axle placement, or create a completely custom frame design, our process is designed to ensure precision and safety.
We begin by inspecting the vehicle and identifying the best approach to achieve your desired outcome. For frame extensions, we use high-strength materials and precision cutting and welding techniques to lengthen the frame without compromising its structural integrity. For modifications, we focus on optimizing the frame to improve performance and safety, such as adjusting weight distribution or reinforcing areas under stress.
Our team also works with original equipment manufacturer (OEM) standards to ensure that every extension or modification integrates seamlessly with your vehicle’s existing systems. Finally, we apply protective coatings and treatments to safeguard your investment against rust, corrosion, and wear.
At 312 Truck, we combine technical expertise with a deep understanding of the demands of commercial and industrial vehicles. Our team has extensive experience working on custom frame projects and delivers solutions that are safe, reliable, and tailored to your business goals.
When you partner with us, you’ll benefit from:
Whether you’re looking to expand the capacity of your fleet, improve the versatility of your vehicles, or enhance their overall performance, 312 Truck has the expertise and resources to make it happen.
We specialize in frame extensions and modifications for a wide range of commercial and industrial vehicles, including:
No matter the size or type of your fleet, our technicians have the knowledge and tools to handle all your custom frame needs.
If you’re ready to upgrade your fleet with custom frame extensions and modifications, 312 Truck is here to help. We’ll work with you to create solutions that meet your business’s unique needs, ensuring your vehicles are optimized for performance, safety, and reliability.
Call us today at (773) 221-8800 or fill out our online form to request a free estimate. Let us help you take your fleet to the next level with expert frame solutions you can trust.
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"Our business turns old shipping containers into mobile bars and quick-serve restaurants—we needed a paint partner who understands precision. 312 Truck’s marine-grade coatings match our brand colors with a flawless finish every time. Their attention to detail exceeds our clients' high expectations."
"Our garbage trucks endure a lot of wear and tear—from accident damage to rust buildup. 312 Truck handles everything from structural repairs to repainting and de-branding before resale. Their expertise in durable, wear-resistant coatings keeps our fleet looking sharp against the elements."
"312 Truck has been a reliable partner for our vehicle maintenance centers in the Midwest. Their team has helped with everything from Promaster vans to full-size trailers. One of the key reasons we continue to trust them is their excellent communication—keeping us informed throughout."
"Although we handle minor collision work in-house, when it comes to paint, 312 Truck is our go-to. Their pricing is among the most competitive in the Chicagoland area—often half of what others charge—while still delivering high-quality results. They’ve been a valuable extension of our team."
"Every off-season, we turn to 312 to refresh our fleet. They sandblast and repaint dozens of frames, trailers, and specialty paving equipment so everything is ready to hit the road again. Their speed and consistency have never let us down, and the quality of work speaks for itself."
"Keeping our fleet in top shape is a priority, and we need a partner that operates with speed and efficiency. 312 Truck has been instrumental in helping maintain our delivery vehicles—everything from mechanical work to heavy collision and cosmetic repairs for hundreds of our units every year."
"For over 20 years, the Patel family has worked alongside Enterprise Rentals, managing thousands of repairs of all sizes. Their deep knowledge of the collision industry—especially fleet-specific repairs—makes them a trusted resource in keeping our vehicles road-ready."
