Rockwell American Tandem 3,500 lb Trailer Axle Kits – Brakes on 1 Axle
Rockwell American Tandem 3,500 lb Trailer Axle Kits with brakes on 1 axle — configurable tandem trailer axle kits available in Axles Only, Suspension Kit, Build Kit, and Running Gear Kit options. Choose your hub-face / spring-center (HF/SC) measurements for the right fit for utility trailers, cargo trailers, landscape trailers, car haulers, and other tandem axle trailer applications.
Features one electric brake axle, one idler axle, Posi-Lube® greaseable spindles, and durable powder-coated construction. Running Gear Kits include trailer wheels and ST205/75R15 radial trailer tires. Free Shipping in the Lower 48 states.
Price range: $850.00 through $1,615.00
Rockwell American Tandem 3,500 lb Trailer Axle Kits – Brakes on 1 Axle
Whether you’re replacing worn trailer axles or building a trailer from the ground up, these Rockwell American tandem 3,500 lb trailer axle kits provide a reliable foundation for utility trailers, cargo trailers, landscape trailers, car haulers, and other light-duty tandem axle applications.
This tandem configuration includes electric brakes on one axle and an idler axle on the other, offering dependable braking performance while keeping the trailer setup simple and cost effective.
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 Posi-Lube® greaseable spindles, cambered axle tubes, durable powder-coated construction, and integrated electric brakes on one axle for dependable stopping performance and long-term trailer reliability.
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 →
| Included Components | Axles Only | Suspension Kit | Build Kit | Running Gear Kit |
|---|---|---|---|---|
| 3,500 lb Electric Brake Axle | ✓ | ✓ | ✓ | ✓ |
| 3,500 lb Idler Axle | ✓ | ✓ | ✓ | ✓ |
| Double-Eye Leaf Springs | — | ✓ | ✓ | ✓ |
| U-Bolt Kits | — | ✓ | ✓ | ✓ |
| Tandem Axle Hanger Kit | — | — | ✓ | ✓ |
| 15″ 5-Lug Wheels | — | — | — | ✓ |
| ST205/75R15 Radial Trailer Tires | — | — | — | ✓ |
Axles Only: Includes one Rockwell American 3,500 lb electric brake axle and one 3,500 lb idler axle with pre-installed hubs, brake assemblies, and Posi-Lube® spindles.
Suspension Kit: Includes both 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 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 both 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.
- Electric Brakes on One Axle: Includes integrated 10″ x 2-1/4″ electric brake assemblies on one axle for dependable stopping 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 Beams: Designed to improve tire wear, towing stability, and tracking performance under load.
Fitment Notes
These Rockwell American tandem 3,500 lb 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
What is the difference between the kit options?
The Axles Only option includes one brake axle and one idler axle. The Suspension Kit adds leaf springs and U-bolt kits. The Build Kit also includes a tandem axle hanger kit, while the Running Gear Kit includes wheels and ST205/75R15 radial trailer tires for a more complete trailer setup.
How do I measure my trailer axle?
The two main measurements are Hub Face (HF) and Spring Center (SC). Hub Face is measured from the outer face of one hub to the other, while Spring Center is measured from the center of one spring seat to the other. You can also read our How to Measure a Trailer Axle guide for more help.
What size brakes are included?
The brake axle included in these kits features 10″ x 2-1/4″ electric brake assemblies designed for dependable stopping performance on tandem axle trailer applications.
What are Posi-Lube® spindles?
Rockwell American Posi-Lube® spindles include built-in grease zerks that allow grease to flow through the spindle into the hub assembly, making bearing lubrication easier during routine maintenance.
What trailers are these axle kits commonly used on?
These tandem 3,500 lb trailer axle kits are commonly used on utility trailers, cargo trailers, landscape trailers, car haulers, and other tandem axle trailer applications.
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.
Verify your tandem trailer axle specifications below to help ensure proper fitment, suspension alignment, wheel compatibility, and towing performance.
| Brand | Rockwell American |
|---|---|
| Configuration | Tandem axle setup with brakes on 1 axle |
| Total Capacity | 7,000 lbs GAWR |
| Axle Capacity | 3,500 lbs per axle |
| Brake Axle Type | Electric brake axle |
| Idler Axle Type | Idler axle |
| Brake Size | 10″ x 2-1/4″ |
| Available Configurations | Axles Only, Suspension Kit, Build Kit, or Running Gear Kit |
| Bolt Pattern | 5 on 4.5″ or 5 on 5″ |
| Lubrication System | Posi-Lube® greaseable spindles |
| Spindle Type | Straight #84 spindles |
| Axle Beam | 2-3/8″ OD round cambered axle tube |
| Leaf Springs | Double-eye 4-leaf trailer springs, 25.25″ eye-to-eye |
| Spring Pads | Underslung, pre-welded spring seats |
| Camber | Yes |
| Hub Face (HF) | Varies by selected option |
| Spring Center (SC) | Varies by selected option |
| Includes Hanger Kit | Included with Build Kit and Running Gear Kit configurations |
| Wheel & Tire Package | Included on Running Gear Kit configurations |
| Wheel Size | 15″ 5-lug trailer wheels |
| Tire Size | ST205/75R15 |
| Tire Type | Radial trailer tires |
| Idler Hub | #84545 |
| Brake Drum | #94545 – 10″ x 2-1/4″ hub & drum |
| Brake Backing Plates | #4701-L and #4701-R electric brake assemblies |
| Inner Bearing | L68149 |
| Outer Bearing | L44649 |
| Inner Race | L68111 |
| Outer Race | L44610 |
| Grease Seal | 10-19 double-lip grease seal |
| Wheel Stud Size | 1/2″-20 |
| Country of Origin | Made in USA |
| Warranty | 2-Year Manufacturer Warranty |
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