3500 lb Single Axle Kit Idler 89/74 – Master Kit (612S & 614S)

SKU # 35SA8974545MK

Build a complete 6′ wide single axle utility trailer with this comprehensive 3,500 lb Master Kit. Designed around an 89″ hub face / 74″ spring center idler axle, this package includes the trailer blueprints, axle and suspension, tires and wheels, fenders, coupler, jack, lighting, wiring, gate hardware, tie-down points, safety chains, and other essential trailer components.

This Master Kit is designed to support 6′ x 12′ and 6′ x 14′ single axle utility trailer builds, including flat or dovetail configurations depending on your chosen blueprint and fabrication setup.

What’s Included

Blueprints

• (1) Utility Trailer 6′ x 12′ Single Axle Flat / Dove Tail Blueprint Package

Axle & Suspension

• (1) 3,500 lb Idler Axle – 89″ Hub Face / 74″ Spring Center
• Double Eye Leaf Springs
• U-Bolt Mounting Hardware
• (1) Single Axle Hanger Kit

Tires, Wheels & Fenders

• (2) ST205/75R15 Trailer Tires & Wheels – 5 Lug
• (10) Lug Nuts
• (2) Smooth Rolled Single Axle Fenders
• (2) Single Fender Backs

Coupler, Jack & Safety Equipment

• (1) 2″ Trailer Coupler
• (1) 5,000 lb Trailer Jack
• (1) Jack Foot Plate
• (2) 5/16″ x 30″ Grade 70 Safety Chains with 7,600 lb S-Hooks
• (2) Chain Loops

Frame & Fabrication Components

• (1) Cover Plate
• (2) Indicator Tabs

Trailer Wiring & Lighting

• (1) 25′ 4-Way Flat Trailer Wiring Harness
• (1) 12V LED Left / Right Tail Light Set
• (1) 3-Light LED Identification Light Bar
• (2) 3/4″ Amber LED Side Marker Lights
• (1) License Plate Bracket
• (2) Light Brackets

Gate & Latch Hardware

• (6) Inner Gate Hinges
• (2) Outer Gate Hinges
• (2) Tailgate Latches – Left & Right
• (2) U-Latches

Cargo & Visibility Components

• (4) Tie-Down Rings
• (4) 2″ x 12″ Conspicuity Tape Strips
• (2) 1″ x 12″ Conspicuity Tape Strips

Kit Specifications

Features & Benefits

Complete Single Axle Trailer Build Package

This Master Kit combines the major mechanical, electrical, safety, and body components needed for a 6-foot-wide single axle utility trailer build.

3,500 lb 89/74 Idler Axle

The included 89-inch hub face / 74-inch spring center idler axle provides a dependable foundation for medium-duty single axle utility trailer applications.

ST205/75R15 Tire & Wheel Assemblies

Two ST205/75R15 5-lug trailer tire and wheel assemblies are included along with the required lug nuts, giving you a ready-to-install wheel package.

Complete Suspension System

The axle, leaf springs, U-bolt hardware, and single axle hanger kit are matched together to simplify installation and fabrication.

Smooth Rolled Steel Fenders

A pair of smooth rolled single axle fenders and matching fender backs provide proper tire coverage while giving the finished trailer a clean, professional appearance.

LED Trailer Lighting System

The kit includes LED tail lights, amber side marker lights, a three-light identification bar, a 25-foot 4-way flat wiring harness, light brackets, and a license plate bracket.

Complete Gate Hardware

Six inner gate hinges, two outer hinges, left and right tailgate latches, U-latches, and indicator tabs provide the primary hardware needed for the trailer gate assembly.

Tie-Down & Safety Components

Four tie-down rings provide convenient cargo securement points, while Grade 70 safety chains, chain loops, and conspicuity tape add important towing and visibility components.

Trailer Tongue Components

The included 2-inch coupler, 5,000 lb jack, jack foot plate, and cover plate provide key components for completing the front of the trailer.

Common Applications

• 6′ x 12′ Utility Trailers
• 6′ x 14′ Utility Trailers
• Flat Deck Utility Trailers
• Dove Tail Utility Trailers
• Lawn & Landscape Trailers
• ATV & UTV Trailers
• Motorcycle Trailers
• Small Equipment Trailers
• Farm & Property Trailers
• General-Purpose Cargo Trailers
• DIY Trailer Builds
• Trailer Fabrication Projects

Why Choose a Master Kit?

Building a trailer from scratch requires far more than just an axle and tires. This Master Kit simplifies the process by combining the blueprints, axle, suspension, wheels, fenders, towing hardware, electrical system, gate hardware, safety equipment, tie-down points, and fabrication components into one package.

That means fewer individual parts to source, fewer compatibility concerns, and a clearer path from raw steel to a completed trailer.

Important Fitment & Build Information

Please verify all measurements, capacities, and component requirements before beginning your trailer build.

• Hub Face: 89″
• Spring Center: 74″
• Axle Capacity: 3,500 lbs
• Axle Type: Idler / Non-Braking
• Tire Size: ST205/75R15
• Coupler Size: 2″
• Wiring: 4-Way Flat

The 3,500 lb axle rating does not automatically mean the completed trailer is rated for 3,500 lbs of payload. Final trailer capacity and legal GVWR depend on the completed trailer design and the lowest-rated component in the assembly, including the frame, axle, suspension, tires, wheels, coupler, and other hardware.

Need help with your build or selecting the correct trailer kit? Contact Highway 96 Trailers and our team can help you choose the right setup for your project.