6’10” × 18.5′ Car Hauler / Equipment Trailer Plans – 12,000 lb GVWR

Product Overview

Build your own heavy-duty 6’10” × 18.5′ tandem-axle car hauler and equipment trailer with these professionally engineered trailer plans. Designed for a maximum 12,000 lb Gross Vehicle Weight Rating (GVWR), these plans are ideal for hauling cars, trucks, Jeeps, UTVs, tractors, skid steers, and a wide variety of equipment.

Engineered using tandem 6,000 lb leaf-spring axles, the trailer features a rugged welded steel I-beam frame that provides exceptional strength while maintaining a low deck height for easier loading. Builders can also shorten the trailer to approximately 18′ or 17′, allowing you to choose the trailer length that best matches your hauling needs.

Multiple engineered configuration options are included throughout the plans, including deck styles, removable or fixed fenders, loading ramps, tie-down anchor locations, front rail options, winch mounting, tongue accessories, and more, allowing you to configure the trailer to match your hauling needs.

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Complete Plan Package Includes

Plan Model: Mu718DS120C (7×18-120ds-cctrailer)

• 40 pages of detailed engineering drawings
• 20 pages of instructions, materials lists, options, engineering considerations, and illustrated building guidance
• Material Cut List
• Purchased Components List (BOM)
• Trailer Frame, Tongue, Axle, and Suspension Details
• Multiple Deck, Fender, and Ramp Configurations
• Steel Loading Ramp Designs and Storage Options
• Tie-Down Anchor, Front Rail, and Winch Options
• Toolbox, Tongue Jack, Tongue Tray, and Rear Support Options
• Illustrated Construction Techniques and Practical Building Guidance

Trailer components, steel, axles, suspension, brakes, wheels, tires, decking, ramps, winches, electrical components, and fabrication materials are NOT included with the plans. Matching Trailer Parts Kits are available separately.

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Available Plan Formats

Instant PDF Download

Download your plans immediately after checkout and begin building right away. The downloadable ZIP file contains the complete engineering drawing package, instructions, materials information, and supporting documents.

Professionally Printed Paper Plans

Prefer working from paper in the shop? Choose our professionally printed plan package.

• Engineering drawings printed on 11″ × 17″ sheets for improved readability
• Instructions printed on standard 8.5″ × 11″ pages
• Shipped flat — never rolled or folded
• Free shipping within the lower 48 states

Important: Printed engineering drawings are provided for reference during construction and should never be scaled for dimensions. Always use the dimensions and measurements provided within the plans.

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Heavy-Duty I-Beam Construction

The trailer is built around a heavy-duty welded steel I-beam frame engineered to provide exceptional strength, rigidity, and long-term durability for demanding hauling applications. Structural I-beams are combined with welded C-channel, angle, and other steel components to create a durable fixed-deck trailer capable of supporting a maximum 12,000 lb Gross Vehicle Weight Rating (GVWR).

Designed using tandem 6,000 lb leaf-spring axles, the trailer maintains a low deck height for easier loading while providing excellent stability for hauling cars, trucks, Jeeps, UTVs, tractors, skid steers, and a wide variety of equipment. Builders may also shorten the trailer to approximately 18′ or 17′ using the instructions included with the plans.

Proper fabrication, welding, material selection, component installation, and load placement remain essential to the safety, durability, and long-term performance of the completed trailer.

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Customizable Trailer Options

These plans include numerous engineered configuration options, allowing you to build the trailer that best fits your hauling needs.

• Approximately 18.5′, 18′, or 17′ Trailer Length
• Double-Eye or Slipper Leaf Spring Suspension
• Solid, Plank, or Split Deck
• Wood or Metal Decking
• Removable, Welded, or Bolted Fenders
• Multiple Loading Ramp Lengths, Widths, Materials, and Capacities
• Slide-Under Ramp Storage
• Multiple Tie-Down Anchor Locations
• Optional Front Rail (Short or Tall)
• Fixed or Removable Winch Mount
• Tongue-Mounted Toolbox or Tongue Tray
• Multiple Tongue Jack Options
• Rear Support Options

Thinking about customizing these trailer plans? Read When Safe to Customize the Plans before making modifications to the original engineered design.

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Matching Trailer Parts Kit

Complete your build with our matching 6’10” × 18.5′ Car Hauler / Equipment Trailer Parts Kit – 12K. Designed specifically for these plans, the kit simplifies your build by grouping compatible major trailer components into one convenient package.

View the Matching 12K Trailer Parts Kit

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Professionally Engineered Plans

These trailer plans were professionally engineered by Synthesis Engineering Services. The engineering package evaluates structural members, frame geometry, suspension placement, connection points, and load paths to provide a strong, durable trailer design.

As with any trailer project, proper material selection, fabrication quality, welding, assembly, maintenance, loading practices, and compliance with applicable laws remain the responsibility of the builder.

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Recommended Builder Experience

Intermediate. This project is best suited for builders with welding and metal fabrication experience. Familiarity with trailer construction, suspension installation, brake system installation, and 12-volt trailer wiring is recommended before beginning the project.

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Understanding Trailer Weight, GVWR, and Payload

These plans are engineered for a maximum 12,000 lb Gross Vehicle Weight Rating (GVWR). GVWR represents the maximum allowable weight of the completed trailer and everything loaded on it, including cargo, equipment, accessories, and the trailer itself.

The base 12,000 lb trailer weighs approximately 1,500+ lbs before decking and optional equipment. Final trailer weight will vary depending on your material selection, decking, ramps, tie-down options, toolbox, winch, battery, tongue accessories, jack configuration, wheels, tires, axles, and other builder-selected options.

Available payload can be estimated using the following formula:

GVWR − Actual Completed Trailer Weight = Available Payload

For the most accurate payload calculation, weigh the completed trailer on a certified vehicle scale after construction. Always stay within the ratings of the completed trailer, axles, suspension, tires, wheels, coupler, hitch, and all other installed components.

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Frequently Asked Questions

What is included with these trailer plans?

Your purchase includes professionally engineered drawings, illustrated instructions, material cut lists, purchased components lists (BOM), engineering considerations, and multiple trailer configuration options. Steel, trailer components, fabrication materials, and hardware are sold separately.

Can I build the trailer shorter than 18.5 feet?

Yes. The plans include instructions for shortening the trailer to approximately 18 feet or 17 feet while maintaining the original engineered design.

What axle configuration are these plans designed for?

These plans are designed around tandem 6,000 lb leaf-spring axles for a combined 12,000 lb capacity. Builders may choose either double-eye or slipper leaf spring suspension as outlined in the plans.

Can I customize these trailer plans?

Yes. Several engineered configuration options are included throughout the plans. If you are considering modifications beyond those provided, we recommend reading When Safe to Customize the Plans before making changes to the original engineered design.

Are these plans available as a PDF download or printed copy?

Yes. Choose between an instant PDF download or professionally printed paper plans shipped flat for easy use in the shop.

What builder experience is recommended?

These plans are best suited for builders with intermediate welding and fabrication experience. Familiarity with trailer construction, suspension installation, brake systems, and trailer wiring is recommended.

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Why Choose Johnson Trailer Parts?

Johnson Trailer Parts has been helping customers build and maintain trailers since 2000. We provide professionally engineered trailer plans, matching parts kits, trailer axles, suspension components, hydraulic systems, lighting, and thousands of trailer parts backed by knowledgeable customer support before and after the sale.

Whether you’re building your first trailer or adding another trailer to your fleet, we’re committed to providing quality products, dependable service, and the technical support you need to complete your project with confidence.

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Questions?

Need help selecting the right trailer plans or matching parts kit? Our team is happy to help.

Johnson Trailer Parts
Call or Text: (602) 292-9690
Email: sales@johnsontrailerparts.com