ProForm is one of the most widely recognized trailer fender manufacturers in the United States. Known for consistent sizing, strong materials, and reliable fabrication quality, ProForm fenders are used by major trailer manufacturers as well as independent builders across the country.
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This guide provides a clear breakdown of ProForm’s fender specifications, material options, and the reasons their fenders are considered an industry benchmark.
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1. Who Is ProForm?
ProForm is a U.S.-based metal fabrication company specializing in trailer parts—particularly steel fenders, steps, and structural components for utility trailers, car haulers, cargo trailers, and equipment trailers.
They are widely known for:
• Consistent quality
• Standardized dimensions
• Strong weldability
• Short lead times
• Reliable supply for OEMs and distributors
For decades, ProForm’s fenders have set the standard for what trailer manufacturers expect in terms of size, thickness, and shape.
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2. What Makes ProForm Trailer Fenders Stand Out?
1. Accurate & Repeatable Dimensions
ProForm fenders consistently match:
• The stated length
• The correct width
• Uniform height
• Perfect curvature for standard wheel sizes
This is important because many brands produce fenders with small inconsistencies that lead to installation issues.
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2. High-Quality Materials
ProForm primarily uses:
• 14-gauge steel (most popular)
• 16-gauge steel (light duty)
• 13-gauge steel (heavy-duty options)
• Diamond plate steel (premium upgrade)
These gauges align perfectly with industry expectations for trailer durability and weld strength.
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3. Industry-Standard Profiles
ProForm produces the exact shapes used on the majority of American trailers:
• Teardrop fenders
• Radius-style fenders
• Single-axle flat-top fenders
• Tandem fenders (72-inch, most common)
• Diamond plate variants
Their 72×10×17 steel teardrop fender is one of the most widely used fenders in the country.
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4. Strong Weldability
ProForm’s steel bends and thicknesses are optimized for clean welds, making their fenders ideal for:
• Trailer manufacturers
• Welding shops
• Custom builders
• Equipment trailer fabricators
This eliminates issues like warping or inconsistent heat response during welding.
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5. OEM and Aftermarket Support
ProForm supplies:
• Trailer plants
• Fabrication shops
• Repair shops
• Distributors
• Online retailers
Because they’ve been adopted so widely, replacing a ProForm fender is easy—sizes are standardized across the industry.
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3. ProForm’s Most Popular Fender Models
1. 72×10×17 Steel Teardrop Fender
• 72” long
• 10” wide
• 17” tall
• 14-gauge steel
• Standard teardrop center
Best for:
Equipment trailers, car haulers, 16” and 17.5” wheels.
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2. 72×9×17 Steel Teardrop Fender
• 72” long
• 9” wide
• 17” tall
Best for:
Utility trailers using 15”–16” wheels.
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3. 69×10 Radius Fender
• 69” long
• 10” wide
Link to Haway
Best for:
OEM trailers with slightly shorter axle spacing.
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4. Single-Axle Fenders
Common sizes include:
• 28” long × 9” wide
• 32” long × 10” wide
Best for:
Utility trailers, small cargo trailers.
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5. Diamond Plate Series
Available in:
• Teardrop
• Radius
• Flat-top
Best for:
Step surfaces, commercial trailers, premium builds.
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4. Material & Thickness Options
ProForm fenders are available in:
14-Gauge Steel
✔ Best balance of strength and cost
✔ Welds perfectly
✔ Industry standard for tandem fenders
16-Gauge Steel
✔ Light-duty
✔ Best for single-axle trailers
13-Gauge Steel
✔ Heavy-duty, extreme use
✔ Used on equipment trailers and industrial builds
Diamond Plate Steel
✔ Added grip
✔ Extra rigidity
✔ Premium appearance
Aluminum (Less Common)
ProForm is primarily known for steel, but aluminum fenders exist for boat and coastal trailers.
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5. Why Trailer Manufacturers Prefer ProForm
✔ Predictability
Fenders always arrive with consistent dimensions.
✔ Strength
Their steel choices outperform many low-grade imports.
✔ Compatibility
Matches industry-standard axle spacing and wheel sizes.
✔ Reliability
Trusted by thousands of fabrication shops.
✔ Availability
ProForm maintains strong distribution channels.
Simply put:
If a trailer brand uses steel fenders, there’s a good chance they’re using ProForm or a ProForm-style benchmark.
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6. Are ProForm Fenders Good for Aftermarket Replacement?
Yes—because most OEM trailer designs are based around ProForm sizes, replacement is:
• Straightforward
• Guaranteed to match axle spacing
• Compatible with your existing welds or bolt-on mounts
• Easy for welders to adapt to
For example, the 72×10×17 model fits virtually every standard tandem-axle equipment trailer in the U.S.
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Conclusion
ProForm trailer fenders have become the industry standard due to their consistent sizing, strong materials, excellent weldability, and broad compatibility with utility, car hauler, and equipment trailers. Their 72-inch steel teardrop models define what most builders expect from a high-quality fender, and their reliability makes them a preferred choice for OEM manufacturers and repair shops alike.
Buying a trailer is a big investment so you want to be sure you are getting one that fits your needs. Kaufman Trailers has been in business since and has helped countless people narrow their options when it comes to choosing the right trailer. Knowing the right questions to ask can make the process easier and more efficient.
While you always want to consider your budget, there are several other factors you should keep in mind when deciding on a trailer. Here are 9 questions to ask before buying a trailer:
Your answer to this question will greatly narrow down your options. When you’re buying a trailer from Kaufman Trailers, there’s a wide variety of trailers to choose from. The list of trailers we sell includes the following:
If you’re not sure which one will suit your needs, simply let us know. Our experienced team at Kaufman Trailers can review your options and help you find one that suits your needs and budget.
As we mentioned above, another major factor in the decision-making process is your budget. While trailers can certainly get expensive, you’ll also find plenty in your price range. Decide what you want to spend as you look for your ideal trailer.
Many people don’t think about the fact that they have to store the trailer when they’re not using it. Depending on the size trailer you get, you’re going to need to have the space to dedicate to storing it. Consider where you’re going to store your trailer and if that space is large enough. If you don’t have the room, you may want to consider a smaller trailer.
Some trailers have electronic braking systems that can detect when you are putting pressure on the brake pedal. This signals the brakes to engage and helps to reduce the wear and tear on your vehicle. You want to check the braking power on any trailer you are considering, especially if you are transporting liquids because your trailer will need to brake quickly and safely when necessary.
The answer to this question lets the salesperson know which type of trailer to look at first: car hauler, equipment, or landscape. Most trailers are designed for a specific job, and while some may seem multi-purpose, this is not always the case. Some trailers are designed for heavy equipment, or lawn care equipment, while others are best suited for furniture, multiple vehicles, and more.
If you’re looking for a car trailer, certain types of equipment should not be loaded onto a car trailer. Some vehicles may also be too long to fit on an equipment trailer. This is due to the ramp system each trailer has. A heavy skid loader may bend the slide-in ramps used on a car hauler, while the equipment-style stand-up ramps will not allow a long vehicle to extend past the back of the equipment trailer.
When choosing your trailer, you should keep in mind the type of tow vehicle you have (i.e. standard pickup truck, an SUV, etc.) or intend to rent. It is important to choose a trailer that is compatible with your tow vehicle.
As a general rule of thumb, most full-size ½ ton pickup trucks are capable of pulling a one-car trailer. Most ¾ ton pickups can pull two cars. A 1 ½ ton truck is typically able to tow a full load on our five-car double-deck trailer. As mentioned above, the Max six-car trailer typically required a Class 8 or a tandem full-size road tractor.
Above all, selecting a trailer that fits your towing capacity ensures you and your load will make it to your destination safely.
Many of our smaller fender trailers are available with five different axle sizes (capacities). For the salesperson to recommend the correct axle size, they must know the approximate weight you want to tow/haul. A trailer with a 9,990 Gross Vehicle Weight Rating (GVWR) is only rated to haul 7,200 lbs. This is because the trailer itself is included in the GVWR. If your machine weighs 9,500 lbs., then it would be necessary to have a trailer rated for 12,000 lbs. GVWR. This question is also imperative to answer when shopping for a large air brake trailer.
This question also directs the salesperson to the correct trailer model to discuss with the customer. Gooseneck trailers are more stable due to how they hitch to your vehicle. Rather than straining your bumper, gooseneck trailers attach to the rear axle. Almost all of our trailers may be built with a gooseneck connection if that is what the customer prefers.
If you’re shopping for a new trailer, Kaufman Trailers is here to help you find the perfect one. For over 30 years, Kaufman Trailers has been a leader in the trailer industry. Our friendly and knowledgeable staff is here to answer your questions and point you in the right direction. Call us today at 866.455. to learn more about our inventory and find a trailer that is perfect for you!
Contact us to discuss your requirements of Single Axle Trailer Fender Manufacturer. Our experienced sales team can help you identify the options that best suit your needs.