Rockwell American Tandem 3,500 lb Electric Brake Trailer Axle Kits

Rockwell American Tandem 3,500 lb Electric Brake Trailer Axle Kits

Whether you’re replacing worn trailer axles or building a trailer from the ground up, these Rockwell American tandem 3,500 lb electric brake trailer axle kits provide a reliable foundation for utility trailers, cargo trailers, landscape trailers, car haulers, and other tandem axle trailer applications.

This tandem configuration includes electric brakes on both axles for improved stopping performance, towing control, and braking confidence when hauling heavier loads.

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 and durable construction.

Choose from axle-only, suspension, build, and running gear configurations depending on your trailer build requirements and included component needs.

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

All configurations feature Rockwell American axle components with integrated electric brakes, Posi-Lube® greaseable spindles, durable powder-coated construction, and cambered axle tubes designed for long-term trailer performance and easier maintenance.

Free shipping in the lower 48 states.

Compare Kit Options

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

← Swipe left/right to compare all kit options →

Axles Only: Includes two Rockwell American 3,500 lb electric brake axles with pre-installed hubs, brake assemblies, and Posi-Lube® spindles.

Suspension Kit: Includes both brake axles, four double-eye leaf springs, and two U-bolt kits for replacing the primary suspension and axle components on a tandem axle trailer.

Build Kit: Complete tandem axle suspension package including both brake axles, leaf springs, U-bolt kits, and a tandem axle hanger kit for new trailer builds and full running gear replacements.

Running Gear Kit: Complete tandem running gear package including dual brake axles, suspension components, 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 Axles 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.
• 7,000 lb Combined Capacity: Tandem axle configuration rated for 7,000 lbs total GAWR with 3,500 lb capacity per axle.
• Dual Electric Brake Axles: Both axles include integrated 10″ x 2-1/4″ electric brake assemblies for improved braking performance and towing control.
• 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 Beams: Designed to improve tire wear, towing stability, and tracking performance under load.

Fitment Notes

These Rockwell American tandem 3,500 lb electric brake trailer axle kits fit many common tandem axle trailer applications including utility trailers, cargo trailers, landscape trailers, car haulers, 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 tandem 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.