Rockwell American Tandem 5,200 lb Electric Brake Trailer Axle Kits

Rockwell American Tandem 5,200 lb Electric Brake Trailer Axle Kits

Build, repair, or upgrade your trailer with genuine Rockwell American Tandem 5,200 lb Electric Brake Trailer Axle Kits. Designed for utility trailers, cargo trailers, landscape trailers, car haulers, equipment trailers, and heavy-duty trailer applications, these tandem axle kits deliver dependable braking performance, long-lasting durability, and smooth towing.

Available in Axles Only, Suspension Kit, Build Kit, and Running Gear Kit configurations, each package includes carefully matched components for trailer repairs, complete running gear replacement, or new 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 on both axles, Posi-Lube® greaseable spindles, heavy-duty powder-coated axle beams, and premium components engineered for years of dependable service. Running Gear Kits also include 15″ 6-lug trailer wheels with ST225/75R15 radial trailer tires for a complete tandem running gear solution.

Made in America. 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 →

Axles Only: Includes two genuine Rockwell American 5,200 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 compatible suspension components.

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

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

Running Gear Kit: Our most complete package, adding four matching 15″ 6-lug trailer wheels and ST225/75R15 radial trailer tires for a near bolt-on tandem running gear solution.

Axles Only and Suspension Kit configurations are commonly selected for repairs and partial upgrades. Build Kit and Running Gear Kit configurations are better suited for complete trailer builds and major 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. Correct measurements help ensure proper wheel positioning, suspension alignment, tire clearance, and overall trailer fitment.

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

Important: Measure your existing axle before ordering. Do not select a replacement axle based only on trailer deck width, frame width, fender spacing, or overall trailer width.

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.
• 10,400 lb Combined Capacity: Tandem axle configuration with two 5,200 lb electric brake axles designed for medium-duty utility, cargo, landscape, car hauler, and equipment trailers.
• Electric Brakes on Both Axles: Pre-installed 12″ × 2″ electric brake assemblies provide dependable stopping power, improved towing control, and increased braking confidence.
• Posi-Lube® Spindles: Integrated grease fittings simplify routine bearing lubrication without removing the hubs.
• Heavy-Duty 3″ Axle Tubes: High-strength cambered axle beams promote proper wheel alignment, stable towing, and even tire wear under load.
• Durable Powder-Coated Finish: Helps protect against corrosion, road debris, weather exposure, and everyday trailer use.
• 6 on 5.5 Bolt Pattern: Compatible with most common 6-lug trailer wheels used on 5,200 lb trailer axles.

Posi-Lube® Spindle System

Every Rockwell American 5,200 lb trailer axle included in these tandem axle kits features genuine Posi-Lube® greaseable spindles, making routine bearing maintenance quicker and easier than traditional axle designs.

Grease is delivered through the center of each spindle and distributed directly into the hub assembly, helping purge old grease while reducing bearing maintenance time. When serviced correctly, Posi-Lube® spindles help maximize bearing life and keep your trailer operating reliably.

Common Applications

• Utility Trailers
• Cargo Trailers
• Landscape Trailers
• Car Haulers
• Equipment Trailers
• Construction Trailers
• Farm & Ranch Trailers
• Custom Trailer Builds

These Rockwell American tandem 5,200 lb electric brake trailer axle kits are ideal for trailer repairs, running gear replacement, suspension upgrades, and complete trailer construction.

Fitment & Capacity Notes

• Verify your hub face (HF) and spring center (SC) measurements before ordering.
• Confirm the selected 6 on 5.5 bolt pattern matches your existing or planned trailer wheels.
• Verify wheel, tire, suspension, brake, and trailer frame ratings before loading.
• Check for adequate tire, fender, and frame clearance throughout suspension travel.
• Electric brakes require a compatible brake controller, properly functioning trailer wiring, and a breakaway system where required.
• The 10,400 lb combined axle capacity represents the combined Gross Axle Weight Rating (GAWR) of both axles and does not determine your trailer’s overall GVWR or payload capacity.
• Overall trailer capacity is limited by the lowest-rated component in the complete trailer system.
• Hanger installation, axle alignment, and welding should be completed by a qualified trailer fabricator when applicable.

Frequently Asked Questions

Resources & Downloads

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

Installation Video

Watch our installation video for helpful guidance on trailer axle measurements, tandem suspension setup, hanger placement, and replacement axle selection.

Need Help?

Need help choosing the correct tandem 5,200 lb trailer axle kit, verifying your hub face and spring center measurements, or selecting the right kit configuration? Our knowledgeable team is happy to help confirm fitment before you order.

Call or Text: (602) 292-9690

Email: sales@johnsontrailerparts.com