3500 lb Tandem Axle Kit (7K Capacity) 89/74 – Master Kit (616TD)

SKU # 35TAD8974545MK

Build a complete 6′ x 16′ tandem axle dovetail utility trailer with this comprehensive 7,000 lb Master Kit. Designed around two 3,500 lb axles with an 89″ hub face / 74″ spring center, this package includes one idler axle, one electric brake axle, trailer blueprints, suspension components, tires and wheels, tandem fenders, coupler, jack, lighting, wiring, breakaway equipment, gate hardware, tie-down points, and key fabrication components.

The 616TD Master Kit adds a transition plate and dovetail-related fabrication hardware to the standard tandem setup, making it a more complete package for a 6′ x 16′ tandem axle dovetail trailer build.

What’s Included

Blueprints

• (1) Utility Trailer 6′ x 14′ / 6′ x 16′ Tandem Axle Flat / Dove Tail Blueprint Package

Axles & Suspension

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

Tires, Wheels & Fenders

• (4) ST205/75R15 Trailer Tires & Wheels – 5 Lug
• (20) Lug Nuts
• (2) Smooth Rolled Tandem Axle Fenders
• (2) Tandem Fender Backs
• (2) Fender Steps with Holes – LH/RH
• (2) Fender Steps without Holes – LH/RH

Coupler, Jack & Safety Equipment

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

Frame & Fabrication Components

• (1) Transition Plate
• (1) Cover Plate
• (2) Joining Plates
• (2) Indicator Tabs

Trailer Wiring & Lighting

• (1) 7-Way Trailer Plug
• (50′) Color-Coded Trailer Wire
• (1) 12V LED Left / Right Tail Light Set
• (1) 3-Light LED Identification Light Bar
• (4) 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 616TD Trailer Build Package

This Master Kit combines the major running gear, electrical, braking, safety, gate, and fabrication components needed to build a 6′ x 16′ tandem axle dovetail utility trailer.

7,000 lb Combined Axle Capacity

Two 3,500 lb axles provide a combined axle capacity of 7,000 lbs, giving the trailer a solid foundation for utility, landscape, equipment, and general hauling applications.

Idler & Electric Brake Axle Combination

One axle is configured as an idler while the second is equipped with electric brakes, providing trailer braking capability when connected to a properly equipped tow vehicle and brake controller.

89/74 Axle Configuration

Both axles feature an 89-inch hub face and 74-inch spring center, making the critical axle dimensions easy to confirm before fabrication.

Dovetail Transition Components

The included transition plate and joining plates provide key fabrication components for constructing the transition between the main trailer deck and dovetail section.

Complete Tandem Suspension

The axles, springs, U-bolt mounting hardware, and tandem axle hanger kit provide the core suspension components needed to install and support both axles.

Four ST205/75R15 Tires & Wheels

Four ST205/75R15 5-lug trailer tire and wheel assemblies are included along with the required lug nuts, completing the primary running gear package.

Tandem Fenders & Fender Steps

Smooth rolled tandem fenders, fender backs, and left/right fender steps are included to provide tire coverage and a finished exterior around the tandem axle assembly.

Electric Brake Wiring & Breakaway System

A 7-way plug, 50 feet of color-coded wiring, electric brake axle, and breakaway kit provide the primary electrical components needed for the trailer braking system.

Complete LED Lighting Package

The kit includes LED tail lights, four amber side marker lights, a three-light identification bar, license plate bracket, and mounting brackets for the trailer lighting system.

Gate & Cargo Hardware

Inner and outer gate hinges, tailgate latches, U-latches, indicator tabs, and four tie-down rings provide essential hardware for the rear gate and cargo securement system.

Common Applications

• 6′ x 16′ Dove Tail Utility Trailers
• Tandem Axle Utility Trailers
• Landscape Trailers
• Lawn Care Trailers
• ATV & UTV Trailers
• Small Equipment Trailers
• Farm & Property Trailers
• Construction Trailers
• General-Purpose Cargo Trailers
• DIY Trailer Builds
• Custom Trailer Fabrication

Why Choose a Master Kit?

Building a tandem axle dovetail trailer requires far more than an axle and tire package. This Master Kit combines the blueprints, axles, suspension, tires, fenders, towing hardware, electrical system, braking components, transition hardware, gate hardware, tie-downs, and safety equipment into one coordinated package.

That means fewer individual components to source and a much 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.

• Trailer Application: 6′ x 16′ Tandem Axle Dove Tail
• Hub Face: 89″
• Spring Center: 74″
• Individual Axle Capacity: 3,500 lbs
• Combined Axle Capacity: 7,000 lbs
• Axle Setup: 1 Idler + 1 Electric Brake
• Tire Size: ST205/75R15
• Coupler Size: 2″
• Electrical Connection: 7-Way
• Breakaway Kit: Included
• Transition Plate: Included

The 7,000 lb combined axle rating does not automatically mean the completed trailer is rated for 7,000 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, suspension, tires, wheels, coupler, brakes, and other hardware.

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