Rockwell American 5,200 lb Electric Brake Trailer Axle Kits

Rockwell American 5,200 lb Electric Brake Trailer Axle Kits

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

Available in Axle Only, Suspension Kit, Build Kit, and Running Gear Kit configurations, each package includes carefully matched components for trailer repairs, running gear replacement, or complete trailer construction. Multiple hub face, spring center, and bolt pattern options are available to match your trailer.

Rockwell American trailer axles are part of the Dexter family of trailer axle brands and feature 12″ x 2″ electric brake assemblies, Posi-Lube® greaseable spindles, durable powder-coated axle beams, and heavy-duty construction designed for years of reliable service. Running Gear Kits also include 15″ 6-lug trailer wheels with ST225/75R15 radial trailer tires for a complete running gear solution.

Made in America. Free Shipping in the Lower 48 States.

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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 5,200 lb electric brake trailer axle with pre-installed 12″ x 2″ electric brake assemblies, hub-and-drum assemblies, and Posi-Lube® greaseable spindles. Ideal for replacing an existing trailer axle while reusing compatible suspension components.

Suspension Kit: Includes everything in Axle Only plus double-eye leaf springs and a U-bolt kit. 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 single-axle hanger kit. Ideal for new trailer construction, frame-up builds, and complete suspension replacement.

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

Axle 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.

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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.

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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.
• 5,200 lb Axle Capacity: Designed for medium-duty utility trailers, cargo trailers, landscape trailers, car haulers, and equipment trailers requiring dependable towing performance.
• 12″ x 2″ Electric Brakes: Pre-installed electric brake assemblies provide dependable stopping power and improved towing control.
• Posi-Lube® Spindles: Integrated grease fittings simplify routine bearing lubrication without removing the hubs.
• Heavy-Duty 3″ Axle Tube: High-strength cambered axle beam promotes 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.

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Posi-Lube® Spindle System

Every Rockwell American 5,200 lb trailer axle includes genuine Posi-Lube® greaseable spindles, making routine bearing maintenance quicker and easier than traditional axle designs.

Grease is delivered through the center of the 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.

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Common Applications

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

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

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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 breakaway system where required.
• The 5,200 lb axle capacity represents the axle’s Gross Axle Weight Rating (GAWR) 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.

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Frequently Asked Questions

What is the difference between the kit options?

Axle Only includes a genuine Rockwell American 5,200 lb electric brake trailer axle with pre-installed hub-and-drum assemblies and Posi-Lube® greaseable spindles. The Suspension Kit adds double-eye leaf springs and a U-bolt kit. The Build Kit includes everything in the Suspension Kit plus a complete single-axle hanger kit. The Running Gear Kit includes everything in the Build Kit plus two 15″ 6-lug trailer wheels and ST225/75R15 radial trailer tires.

How do I measure my trailer axle?

Measure the hub face (HF) from the wheel-mounting surface on one hub to the wheel-mounting surface on the opposite hub. Measure the spring center (SC) from the center of one spring seat to the center of the opposite spring seat. You can also read our How to Measure a Trailer Axle Guide for additional help.

What size brakes are included?

These Rockwell American 5,200 lb trailer axle kits include pre-installed 12″ x 2″ electric brake assemblies designed to provide dependable stopping performance for medium-duty trailer applications.

What are Posi-Lube® spindles?

Rockwell American Posi-Lube® spindles use integrated grease fittings and an internal lubrication passage to help direct grease into the hub assembly during routine maintenance, making bearing lubrication faster and more convenient.

Can I reuse my existing trailer springs?

Yes, provided they match the axle capacity, spring width, spring length, and mounting configuration. Many customers choose the Suspension Kit or Build Kit when replacing worn suspension components at the same time.

What trailers are these axle kits commonly used on?

These Rockwell American 5,200 lb electric brake trailer axle kits are commonly used on utility trailers, cargo trailers, landscape trailers, car haulers, equipment trailers, construction trailers, and farm trailers.

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Resources & Downloads

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

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Installation Video

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

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Need Help?

Need help choosing the correct 5,200 lb trailer axle, 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