Our Services

We deliver precision-engineered wheelbase extensions and chassis modifications tailored to meet specific load, compliance, and operational requirements. Whether improving stability, increasing payload capacity, or adapting vehicles for specialised applications, our modifications are designed with structural integrity and performance in mind.

All work is completed in accordance with Australian Design Rules (ADR) and in partnership with certified VASS engineers, ensuring full compliance and certification. With a strong focus on accuracy and durability, every modification is executed using proven engineering methods and high-quality materials — built to handle the demands of Australia’s commercial transport industry.

Define Engineering manufactures custom wiring harnesses for commercial vehicles, trailers and custom automotive applications. Built locally in Melbourne, our harnesses are made to suit the exact setup and requirements of each vehicle, making installation cleaner, simpler and more reliable.

We produce harnesses for a wide range of applications including lighting systems, custom trays, canopies, trailers, truck modifications and other specialised electrical setups. Whether it’s a complete harness built from scratch or modifications to an existing system, we can create a solution to suit your project.

All harnesses are built using quality components and are clearly labelled, neatly finished and pre-tested before installation or supply. We focus on building wiring systems that are reliable, easy to work with and able to handle the demands of everyday commercial use.

Our workshop also uses automated harness manufacturing equipment to ensure consistency and accuracy across every build. From one-off custom jobs to ongoing production work, we take pride in delivering high quality wiring solutions with attention to detail throughout the entire process.

Define Engineering provides automotive electrical solutions for trucks, commercial vehicles and custom builds.

From wiring repairs and lighting upgrades to complete electrical fit-outs, we work on a wide range of electrical systems tailored to suit each vehicle and application. Our services include accessory installation, trailer connections, brake controllers, fault finding, custom wiring and electrical repairs.

Whether it’s part of a new build, accident repair or vehicle upgrade, we focus on neat workmanship, reliable components and practical solutions built to handle day-to-day commercial use.

At Define Engineering, we build custom fabrication solutions to suit all kinds of work vehicles and commercial applications. From custom trays, toolboxes and ramps to trailers and full canopy fit-outs, everything is made to suit your specific needs and how you actually use your setup day to day.

Whether you need extra storage, a more practical layout or a completely custom build, we work with you to create something that’s functional, strong and built to last. We can modify existing setups or fabricate something from scratch depending on the job.

All fabrication work is completed locally in Melbourne using quality materials and attention to detail throughout the build process. We focus on practical, reliable solutions that not only look good but can handle the demands of everyday commercial use. No matter the size of the project, we take pride in delivering high quality workmanship and a finished product that works the way it should.

Define Engineering provides reliable truck repair and maintenance services for commercial vehicles, trailers and custom setups. Our workshop carries out a wide range of repair work including electrical repairs, insurance repairs, general damage repairs, component replacements, touch-ups and refurbishment work.

We understand that commercial vehicles experience heavy daily use, which is why we focus on practical repairs that keep your equipment operating safely and reliably. Whether it’s repairing damaged components, replacing worn parts, troubleshooting electrical issues or restoring work vehicles back to a professional standard, our team delivers quality workmanship with attention to detail throughout every job.

We also work closely with customers requiring modifications or repairs to custom-built equipment, trays, canopies and trailers. All work is completed locally in Melbourne using quality materials and a practical approach built around durability, functionality and minimising downtime for your business.

Define Engineering provides professional towbar installation solutions for commercial trucks, transport vehicles and heavy duty applications. We supply and install purpose-built towing systems designed to suit the specific requirements of each vehicle and the demands of everyday commercial use.

We regularly work with Bartlett Towbars, while also offering solutions across a range of towbar brands and setups depending on the application. Whether you require towing capacity for trailers, equipment transport or specialised commercial operations, our team can help configure a towing solution that is practical, reliable and built to last.

Our services can also include trailer plug installations, electric brake controller setups and associated electrical work to ensure your towing system is fully functional and ready for use. All installations are completed locally in Melbourne with attention to detail, quality workmanship and a strong focus on safety, durability and compliance.