Rockwell American 3,500 lb Electric Brake Trailer Axle Kits

Rockwell American 3,500 lb Electric Brake Trailer Axle Kits

Whether you’re replacing a worn axle or building a trailer from the ground up, these Rockwell American 3,500 lb electric brake trailer axle kits provide a reliable starting point for utility trailers, cargo trailers, landscape trailers, boat trailers, and other light-duty single-axle applications.

Rockwell American trailer axles are part of the Dexter family of trailer axle brands and are trusted by trailer builders, repair shops, and haulers across the U.S. for dependable towing performance, integrated braking capability, and durable construction.

Choose from axle-only, suspension, build, and running gear configurations to match your trailer project, whether you need a simple replacement or a complete setup.

Available in multiple hub face and spring center sizes, these kits range from axle-only replacements to complete running gear systems with wheels and ST205/75R15 radial trailer tires.

All configurations feature Rockwell American axle components with integrated electric brake assemblies, Posi-Lube® greaseable spindles, cambered axle tubes, and durable powder-coated construction designed for dependable braking performance and long-term trailer reliability.

Free shipping in the lower 48 states.

Compare Kit Options

Select the trailer axle package that best matches your trailer repair, replacement, or new trailer build requirements.

← Swipe left/right to compare all kit options →

Axle Only: Includes a genuine Rockwell American 3,500 lb electric brake trailer axle with pre-installed brake assemblies, hubs, and Posi-Lube® spindles for trailer axle replacement applications.

Suspension Kit: Includes the electric brake axle, double-eye leaf springs, and U-bolt kit for replacing worn suspension and braking components on a single-axle trailer.

Build Kit: Complete trailer suspension package including the electric brake axle, leaf springs, U-bolt kit, and single-axle hanger kit for new trailer builds and full running gear replacements.

Running Gear Kit: Complete trailer running gear package including the electric brake axle, leaf springs, U-bolt kit, hanger kit, wheels, and ST205/75R15 radial trailer tires for a near bolt-on trailer axle solution.

Build Kit and Running Gear Kit configurations are commonly selected for complete trailer builds and major trailer rebuilds, while Axle Only and Suspension Kit options are popular for repairs and partial upgrades.

Choose Your Axle Size (Hub Face / Spring Center)

Select the hub face (HF) and spring center (SC) measurements that match your trailer frame and suspension setup for proper alignment, tire clearance, and safe towing performance.

• Hub Face (HF): Measured from the outer face of one hub to the outer face of the opposite hub
• Spring Center (SC): Measured from the center of one spring seat to the center of the opposite spring seat

Matching the correct hub face and spring center measurements helps ensure proper fender clearance, suspension alignment, wheel positioning, and overall trailer fitment.

Not sure which axle size you need? Read our How to Measure a Trailer Axle guide or contact us and we’ll help verify your measurements before you order.

Key Features

• Rockwell American Quality: Genuine Rockwell American axle components backed by Dexter manufacturing expertise and made in the USA.
• 3,500 lb Capacity: Designed for utility trailers, cargo trailers, landscape trailers, enclosed trailers, and other light-duty single-axle applications.
• Integrated Electric Brakes: Includes pre-installed 10″ x 2-1/4″ electric brake assemblies for dependable trailer braking performance.
• Posi-Lube® Spindles: Built-in grease zerks allow quick bearing lubrication without removing the hubs.
• Durable Powder-Coated Finish: Helps resist corrosion from road debris, weather, and moisture exposure.
• Cambered Axle Beam: Designed to improve tire wear, towing stability, and tracking performance under load.

Fitment Notes

These Rockwell American 3,500 lb electric brake trailer axle kits fit many common single-axle trailer applications including utility trailers, cargo trailers, landscape trailers, boat trailers, and equipment trailers.

Always verify your trailer’s overall GVWR, wheel ratings, tire ratings, and suspension capacity before loading.

Be sure to verify your hub face measurement, spring center measurement, bolt pattern, wheel and tire specifications, and included components before ordering since exact specifications vary by selected configuration.

Frequently Asked Questions

Helpful Resources

• Rockwell American Trailer Axle Service Guide
• Trailer Hanger Kit Spacing Guide
• How to Measure a Trailer Axle
• Johnson Trailer Parts YouTube Channel

Installation Video

Watch our video for trailer axle tips, measurements, installation guidance, and trailer suspension setup information.

Questions?

Need help choosing the right axle size or trailer axle kit configuration? We can help confirm your measurements and fitment before you order.

Call (602) 292-9690,
email sales@johnsontrailerparts.com,
or contact us through our website.