Fenders & Mounting Hardware

What Are Trailer Fenders and Why Do They Matter?

Trailer fenders are one of the most hardworking — and most overlooked — components on any towing rig. Positioned directly over the trailer's wheels and tires, fenders act as a first line of defense against road debris, mud, rocks, and water that spinning tires throw upward at high speed. Without proper fenders, that debris can damage the trailer frame, your cargo, other vehicles on the road, and even bystanders. Beyond protection, fenders are often required by law for road-legal trailers, making them an essential compliance item as well as a safety feature.

Types of Trailer Fenders

Trailer fenders are available in several materials and configurations to suit different trailer types and duty levels:

• Steel fenders — Typically made from 16-gauge cold-rolled steel, these are the go-to choice for utility, car hauler, and flatbed trailers that need maximum rigidity and impact resistance.
• Aluminum fenders — Lightweight and naturally corrosion-resistant, aluminum fenders are popular on boat trailers and recreational trailers where weight savings and exposure to moisture are key concerns.
• Poly/polyethylene fenders — Molded from high-density polyethylene or polypropylene, these fenders won't rust or dent and are a practical choice for work trucks and trailers in demanding environments.
• Single-axle vs. tandem-axle designs — Single-axle fenders cover one wheel position, while tandem and tri-axle fenders span the longer wheelbase of multi-axle setups.

Fender Mounting Hardware: The Unsung Hero

A fender is only as reliable as the hardware that holds it in place. Mounting brackets, L-brackets, U-bolts, step brackets, and backing plates all play critical roles in ensuring your fenders stay secure over thousands of miles of road vibration. Most fenders require a minimum of two mounting brackets per fender, and many are sold without hardware — making it essential to source the right brackets for your specific trailer frame width, tire size, and fender style. Galvanized steel brackets are the preferred choice for most applications because they resist corrosion, a crucial attribute for trailers that regularly encounter wet conditions such as boat trailers backed into saltwater or freshwater launches.

When selecting mounting hardware, key considerations include the frame width (typically 2" to 3" channels), the required offset distance between the fender and the frame, and whether the installation is a bolt-on or weld-on application. Some systems use L-shaped brackets that clamp to the trailer frame rail, while others rely on U-bolts for a frameless attachment method. Always confirm that your chosen hardware is rated for the load and vibration levels your trailer will experience.

Buyers Products Trailer Fenders & Hardware

Buyers Products is a well-recognized name in truck and trailer equipment, offering a range of poly fenders engineered for work trucks and heavy-duty trailers. Their corrosion-resistant polyethylene fenders are designed to handle the daily wear and tear of commercial and recreational towing applications, covering dual rear wheel configurations from 16.5" up to 24.5" wheels — making them a versatile option for fleet operators and trailering enthusiasts alike.