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Box Trailer Plans

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The Box Trailer

Simple. Reliable. One of the most useful trailers you can own. At Fabplans, we’ve designed a range of box trailer plans that make it easy for you to build your own durable DIY heavy-duty trailer. One that works hard, lasts, and looks great.

Is It Cheaper to Build Your Own Box Trailer?

Building your own box trailer can definitely save money, but the real advantage lies in customisation and quality.

You can buy a basic tandem-axle trailer off the shelf for just under AU$4,000, and it will do the job. But if you’re here, chances are you like quality DIY projects, take pride in your work, and want something built to your own standards.

With Fabplans box trailer designs, you can build one of our 2500kg tandem box trailers for around AU$3,300 in parts and materials (See our trailer pricing guide for a full breakdown of estimated costs).

Sure, it takes more time than buying one, but you’ll end up with a custom trailer you can be proud of. One built to your specifications and capable of lasting for years.

The Everyday Workhorse

The box trailer is the most popular trailer type for good reason. It’s affordable, simple to build, and incredibly versatile. Whether you’re hauling tools, garden waste, building materials, or weekend gear, a well-built box trailer is the ultimate workhorse for home, farm, or business use.

How to Build a Box Trailer

The best way to build a box trailer is to start with a plan. Whether you design your own or use our professionally engineered blueprints, having a clear plan ensures everything fits together correctly and safely.

Once you’ve got your plans sorted, the next step is sourcing a trailer suspension kit. These kits typically include all running gear components: axles, hubs, brakes, and suspension assemblies.

Need help choosing the right suspension? Check out our blog where we compare the most common trailer suspension options. Many trailer parts suppliers also offer pre-packaged kits and can help you match the correct axle and wheel offset.

Our Fabplans trailer plans also include an axle selection chart, helping you calculate the right setup for your build.

Things to Consider When Building Your Box Trailer

Before you begin fabrication, start by determining your main use case. This will help you choose the right size, weight rating, and components.

We offer a range of box trailer plans designed for:

  • Farmers hauling feed, fencing or equipment.
  • Tradies needing a reliable work trailer.
  • Small business owners for transport or delivery use. 
  • Handymen and lawn care operators looking for a versatile all-rounder.

Once you’ve determined what you will use your trailer for, you can then calculate your trailer’s maximum ATM (Aggregate Trailer Mass) and select running gear to suit. For most box trailers, leaf spring suspension is a practical and reliable choice.

Box Trailer Wiring

Trailer wiring can seem daunting, but for a standard 12V system, it’s surprisingly straightforward. Most box trailers only require a few key connections for lights, indicators, and brakes, and our plans include a wiring diagram and information booklet to make it even easier.

We break it all down so you can wire your trailer safely, efficiently, and with confidence.

Additions & Accessories

Want to enhance your box trailer? Fabplans offers a collection of free downloadable plans, including:

  • Trailer ramps for easy loading
  • Box trailer cage for added capacity
  • Storage box for tools and equipment
  • Adjustable trailer stand to prevent tipping during loading

These extras are perfect for turning your standard trailer into a custom-built utility setup.

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LAST UPDATED: 22 August 2025

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We have taken reasonable care to prepare and present material in our digital products to ensure they are accurate and of sound engineering design. It is the sole responsibility of the trailer manufacturer to ensure each trailer:

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  • Is legally registered and maintained for road use.

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