ProForm Trailer Fenders: Specs, Materials, and Why They’re Industry Standard

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.

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

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.