Rockwell American Tandem 7,000 lb Electric Brake Trailer Axle Kits

Rockwell American Tandem 7,000 lb Electric Brake Trailer Axle Kits

Build, repair, or upgrade your trailer with genuine Rockwell American Tandem 7,000 lb Electric Brake Trailer Axle Kits. Designed for equipment trailers, car haulers, dump trailers, gooseneck trailers, flatbed trailers, cargo trailers, utility trailers, and other heavy-duty tandem axle applications, these complete trailer running gear packages deliver dependable braking performance, long-lasting durability, and reliable towing mile after mile.

Each kit includes two genuine Rockwell American 7,000 lb electric brake trailer axles for a combined 14,000 lb Gross Axle Weight Rating (GAWR). Available in Axle Only, Suspension Kit, Build Kit, and Running Gear Kit configurations, every package is designed to simplify tandem axle replacement, trailer running gear upgrades, or complete trailer construction. Multiple Hub Face (HF) and Spring Center (SC) sizes are available to match your trailer frame and suspension.

Rockwell American trailer axles are part of the Dexter family of trailer axle brands and feature 12″ × 2″ electric brake assemblies, Posi-Lube® greaseable spindles, heavy-duty powder-coated axle beams, and premium American-made components engineered for years of dependable service. Running Gear Kits also include 16″ 8-lug trailer wheels with ST235/80R16 radial trailer tires, providing a nearly complete bolt-on tandem running gear solution for new trailer construction or complete running gear replacement.

Made in America. 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 →

Axle Only: Includes two genuine Rockwell American 7,000 lb electric brake trailer axles with pre-installed 12″ × 2″ electric brake assemblies, hub-and-drum assemblies, and Posi-Lube® greaseable spindles. Ideal for replacing existing tandem trailer axles while reusing your current suspension.

Suspension Kit: Includes everything in the Axle Only configuration plus four double-eye leaf springs and two U-bolt kits. Ideal for replacing worn axle and suspension components while retaining your existing hanger system.

Build Kit: Includes everything in the Suspension Kit plus a complete tandem axle hanger kit. Ideal for new trailer construction, frame-up builds, and complete suspension replacement.

Running Gear Kit: Our most complete package, adding four matching 16″ 8-lug trailer wheels and four ST235/80R16 radial trailer tires for a nearly complete bolt-on tandem running gear solution.

Axle Only and Suspension Kit configurations are commonly selected for trailer repairs and partial running gear upgrades. Build Kit and Running Gear Kit configurations are ideal for complete trailer builds, tandem axle conversions, and full running gear replacements.

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 axle alignment, tire clearance, wheel positioning, and safe towing performance.

• Hub Face (HF): Measured from the wheel mounting surface on one hub to the wheel mounting surface on the opposite hub.
• Spring Center (SC): Measured from the center of one spring seat to the center of the opposite spring seat.

Correct Hub Face and Spring Center measurements help ensure proper tandem axle spacing, suspension alignment, tire clearance, fender clearance, 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.

Why Choose Rockwell American?

• Made in America: Genuine Rockwell American trailer axle components manufactured in the USA and backed by the Dexter family of trailer axle brands.
• 14,000 lb Combined Axle Capacity: Two 7,000 lb axles provide a combined 14,000 lb GAWR for heavy-duty tandem axle trailer applications.
• Electric Brakes on Both Axles: Four pre-installed 12″ × 2″ electric brake assemblies provide dependable stopping power, balanced braking, and improved towing control.
• Posi-Lube® Spindles: Integrated grease fittings simplify routine bearing lubrication without requiring the hubs to be removed.
• Heavy-Duty 3″ Axle Tubes: High-strength cambered axle beams help promote proper wheel alignment, stable towing, and even tire wear under load.
• Durable Powder-Coated Finish: Helps protect the axle beams against corrosion, weather exposure, road debris, and everyday trailer use.
• 8 on 6.5 Bolt Pattern: Compatible with commonly used heavy-duty 8-lug trailer wheels for 7,000 lb axle applications.
• Matched Tandem Components: Suspension, hanger, wheel, and tire components are selected to work together as a complete tandem running gear system.

Key Features

• Two Rockwell American 7,000 lb electric brake trailer axles
• 14,000 lb combined Gross Axle Weight Rating
• Electric brakes installed on both axles
• 12″ × 2″ electric brake assemblies
• 8 on 6.5″ wheel bolt pattern
• #42 Posi-Lube® greaseable spindles
• Heavy-duty 3″ round cambered axle tubes
• Pre-welded underslung spring seats
• Powder-coated axle beam finish
• Multiple Hub Face and Spring Center sizes
• Four available kit configurations

Posi-Lube® Spindle System

Every Rockwell American 7,000 lb trailer axle included in these tandem axle kits features genuine Posi-Lube® greaseable spindles, making routine bearing maintenance quicker and more convenient than traditional spindle designs.

Grease is delivered through the center of each spindle and directed into the hub assembly, helping distribute fresh grease through the bearings while pushing older grease outward. This allows routine bearing lubrication to be completed without removing the hub-and-drum assemblies.

When serviced correctly and according to the manufacturer’s maintenance recommendations, Posi-Lube® spindles can help reduce service time, protect wheel bearings, and support dependable trailer operation.

Posi-Lube® systems are intended to simplify routine lubrication but do not eliminate the need for regular bearing, seal, brake, and hub inspections.

Common Applications

• Equipment Trailers
• Car Haulers
• Dump Trailers
• Gooseneck Trailers
• Flatbed Trailers
• Cargo Trailers
• Enclosed Trailers
• Utility Trailers
• Construction Trailers
• Farm and Ranch Trailers
• Skid Steer Trailers
• Custom Trailer Builds

These Rockwell American tandem 7,000 lb electric brake trailer axle kits are well suited for tandem axle replacement, suspension upgrades, complete trailer running gear replacement, and new heavy-duty trailer construction.

Fitment & Capacity Notes

• Verify the required Hub Face (HF) and Spring Center (SC) measurements before ordering.
• Both axles must use matching Hub Face, Spring Center, capacity, brake, and suspension specifications.
• Confirm the selected 8 on 6.5″ bolt pattern matches your existing or planned trailer wheels.
• Verify the leaf spring length, spring capacity, hanger spacing, equalizer dimensions, and suspension configuration before installation.
• Check for adequate tire, wheel, fender, frame, brake wiring, and suspension clearance throughout the full range of suspension travel.
• Electric brakes require a compatible in-cab brake controller and properly functioning trailer brake wiring.
• A correctly installed and operational trailer breakaway system may be required and should be used where applicable.
• Brake assemblies on both axles must be wired correctly and adjusted according to the brake manufacturer’s recommendations.
• The combined 14,000 lb GAWR represents the maximum rated capacity of the two axles and does not determine the trailer’s overall GVWR or payload capacity.
• Overall trailer capacity is limited by the lowest-rated component in the complete trailer system, including the frame, coupler, suspension, wheels, tires, hubs, brakes, safety equipment, and tow vehicle.
• Do not assume that installing two 7,000 lb axles automatically gives an existing trailer a 14,000 lb GVWR.
• Verify wheel and tire load ratings before loading the trailer.
• Hanger installation, axle alignment, suspension setup, and frame welding should be completed by a qualified trailer fabricator when applicable.
• Axles should be installed square and parallel to each other to promote proper tracking and reduce premature tire wear.
• Follow the wheel manufacturer’s recommended lug-nut torque specifications and tightening sequence.
• Recheck lug-nut torque after the initial installation and again after the first period of towing.
• Inspect the brakes, wiring, breakaway system, suspension hardware, bearings, seals, wheels, tires, and lug nuts before placing the trailer into service.

Frequently Asked Questions

Helpful Resources

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

Questions?

Need help selecting the correct tandem axle kit, verifying your Hub Face (HF) and Spring Center (SC) measurements, or choosing the right suspension configuration? Our knowledgeable team is happy to help verify your trailer measurements and ensure you receive the correct components before you order.

Call or Text: (602) 292-9690

Email: sales@johnsontrailerparts.com

Whether you’re replacing worn trailer axles, upgrading your suspension, or building a new trailer from the ground up, we’re here to help you complete your project with confidence.