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Become a Heavy Commercial Trailer Technician
If you want a hands-on trade working on trailers, braking systems and heavy vehicle equipment, MTA’s Heavy Commercial Trailer Technician apprenticeship is your pathway into the industry. You will complete AUR31820 Certificate III in Heavy Commercial Trailer Technology, developing the practical skills needed to inspect, service and repair trailers over 4.5 tonnes.
As South Australia’s dedicated automotive training provider, MTA Training and Employment combines on-the-job experience with hands-on trade school training so you build practical skills in a real workshop environment. Training is delivered at MTA’s Royal Park and Cleve facilities, with access to industry-relevant equipment and experienced trainers.
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Why Choose a Heavy Commercial Trailer Technician Apprenticeship?
Heavy commercial trailers are a vital part of freight and transport operations, and skilled technicians are in high demand as the industry grows and equipment becomes more advanced. This apprenticeship suits people who enjoy practical, problem-solving work and want to build a career in a highly specialised trade.
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Benefits For Apprentices and Employers
A Certificate III in Heavy Commercial Trailer Technology gives apprentices a specialist trade that is essential to freight and transport operations. Employers benefit from staff who can keep trailers in safe working order and reduce downtime in busy fleets and workshops.
Apprenticeships Overview Host An Apprentice

Train Your Apprentice

Train Your Apprentice

Support your apprentice with MTA’s trailer technician training and real workshop learning for the heavy transport industry.

Train Your Apprentice
Become An Apprentice

Become An Apprentice

Start your apprenticeship in heavy commercial trailer technology and build the skills to work on trailers, braking systems and more.

Become An Apprentice
Host An Apprentice

Host An Apprentice

Host a trailer technician apprentice and access MTA’s support to help build your workshop capability.

Host An Apprentice

During your apprenticeship you will:

  • Develop and apply diagnostic strategies to solve complex mechanical and electrical problems.
  • Test, charge and replace batteries, and repair basic electrical circuits and automotive electrical systems.
  • Inspect, service and repair braking, air braking, suspension and hydraulic systems on heavy vehicles and trailers over 4.5 tonnes.
  • Install, repair and maintain wiring, lighting, harnesses and other electrical components.
  • Service engines, mechanical connections, wheel and tyre assemblies, and carry out general maintenance operations on heavy vehicles and trailers over 4.5 tonnes.
  • Carry out welding, metal repairs, thermal heating and cutting, and select and use bearings, seals, gaskets, sealants and adhesives.

 

During your apprenticeship, you will learn how to inspect, service and repair heavy trailers used in demanding transport environments. You’ll develop the practical skills needed to keep freight moving safely and efficiently.

 

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What You Will Learn as a Heavy Commercial Trailer Technician

This apprenticeship is designed to build broad and job-ready skills across the trailer maintenance and repair space. You will gain the technical knowledge to work on a wide range of trailer types and systems used across transport and logistics.

 

You will learn how to:

  • Service and repair trailers over 4.5 tonnes, including single-axle through to multi-axle trailers.
  • Work on braking, suspension, hydraulic and pneumatic systems.
  • Diagnose faults in lighting, wiring, harnesses and other electrical components.
  • Use welding, metalworking and thermal repair techniques to maintain trailer structures.
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Hiran Alwis, MTA SA Trainer Assessor Light Vehicle Technology, conducting hybrid and battery electric vehicle training.

For apprentices, completing a trailer technician apprenticeship means you can:

 

Stand Out in Heavy Transport Roles

Increase your employability with specialist skills in trailer systems, diagnostics and repair.

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Enjoy Practical Daily Work

Work on a wide range of trailer types and systems, keeping your day varied and hands-on.

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For employers, trailer technician apprenticeships can help you:

 

Build Skilled Trailer Technicians

Build technicians who can service and repair trailers in-house, reducing the need to outsource work.

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For employers, trailer technician apprenticeships can help you:

 

Build Skilled Trailer Technicians

Build technicians who can service and repair trailers in-house, reducing the need to outsource work.

Host An Apprentice

Boost Workshop Efficiency

Improve workshop efficiency with staff who understand trailer braking, suspension and electrical systems.

Host An Apprentice

Prepare for Industry Growth

Plan for the future as heavy transport equipment becomes more advanced and specialised.

 

If you would like to discuss how a heavy commercial trailer apprentice could fit into your business, you can learn more about MTA’s automotive apprenticeships and support services for employers through the main MTA apprenticeships page.

Host An Apprentice

Training Model and Supervision

MTA’s training model combines on-the-job learning with structured off-the-job training so you can develop skills in real workshop conditions. Apprentices train across a four-year full-time program, with weekly inductions available so you can begin training when opportunities arise.

Supervision Requirements

Training is delivered at MTA’s Royal Park and Cleve facilities, with access to equipment suited to heavy commercial trailer work. Apprentices are supervised by qualified technicians who help build safe work practices and strong diagnostic skills.

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Entry Pathways and How to Apply

There are two main ways to start your trailer technician apprenticeship with MTA Training and Employment.

Become employed by MTA and be placed with a host employer while you complete your heavy commercial trailer apprenticeship.

Gain an apprenticeship directly with an employer and do your training at MTA’s progressive automotive training facilities.

To start your application, complete the form on MTA’s Apply for an Apprenticeship page and the team will contact you about current opportunities. If you are over 21 years old, MTA’s Adult Apprenticeship Policy provides additional guidance before you apply.

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Course Overview

1

Trailer inspection, service and repair on vehicles over 4.5 tonnes.

2

Braking, air braking, suspension and hydraulic systems.

3

Electrical circuits, wiring, lighting and harnesses.

4

Wheel and tyre assemblies, mechanical connections and general maintenance.

5

Welding, metal repair, thermal heating and cutting.

6

Diagnostic strategies for mechanical and electrical faults.

The Heavy Commercial Trailer Technician apprenticeship gives you the skills to work on trailers and related heavy vehicle systems in a structured, competency-based program. You will complete AUR31820 Certificate III in Heavy Commercial Trailer Technology and progress through practical systems and repair tasks over four years.

Entry Criteria

To be eligible for the Heavy Commercial Trailer Technician apprenticeship, you will generally need to:

 

  • Be an Australian citizen or permanent resident.
  • Be in Year 10 or higher if you are still at school.
  • Successfully complete MTA’s pre-selection test and interview process.
  • Meet literacy and numeracy requirements through an assessment.

A literacy and numeracy assessment forms part of the enrolment process to ensure you meet the minimum required levels. Funding through the South Australian Department for Education requires you to meet a minimum standard; if you are below this level, you will be referred to a provider to access a foundation skills course or foundation skills bridging units. 

 

Individuals seeking access to a Certificate II or III subsidised training place or a Jobs First Employment Project must demonstrate they are at Australian Core Skills Framework (ACSF) Exit Level 2 in reading and numeracy.

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Recognition of Prior Learning

If you already have experience in heavy vehicle, trailer or related mechanical work, Recognition of Prior Learning (RPL) may be available. RPL assesses the skills and knowledge you already have against the qualification units, which may help reduce repeated training.

 

MTA can review previous qualifications, workplace experience and informal learning to determine whether credit or advanced standing applies. This helps you focus on the areas you still need to develop to become fully qualified.

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Why Choose MTA Training and Employment

MTA Training and Employment is South Australia’s only dedicated automotive industry training provider, with training delivered at Royal Park and regional locations. The organisation combines practical, workshop-focused learning with industry access and experienced trainers.

 

Choosing MTA for your Certificate III in Heavy Commercial Trailer Technology means you gain access to a respected training provider, modern facilities and a clear pathway into a specialist trade. MTA also supports apprentices and employers with flexible training arrangements and industry-aligned delivery.

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Employment Opportunities

After completing your apprenticeship, you will have a range of employment opportunities across the heavy transport industry. Heavy commercial trailer technicians are needed to keep freight moving safely and reliably across South Australia and beyond.

Potential roles include:

  • Heavy vehicle repair workshops.
  • Transport and logistics companies.
  • Trailer manufacturing and assembly firms.
  • Fleet maintenance departments.
  • Senior trailer technician, workshop supervisor or service manager roles.

With experience, you can progress into field service, technical training or business ownership.

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Frequently Asked Questions

What is a Heavy Commercial Trailer Technician?

A Heavy Commercial Trailer Technician services, repairs and maintains heavy vehicle trailers used in freight and transport operations. The role includes work on braking, suspension, hydraulics, wiring, lighting and structural repairs.

What are the common issues Heavy Commercial Trailer Technicians fix?

Common issues include braking faults, air system problems, suspension wear, hydraulic failures, wiring damage and structural repairs. Technicians also carry out welding, maintenance and diagnostic work to keep trailers safe and roadworthy.

What qualifications do you need to be a Heavy Commercial Trailer Technician?

You usually need AUR31820 Certificate III in Heavy Commercial Trailer Technology to work as a qualified technician. MTA’s apprenticeship pathway gives you that qualification along with practical, workplace-based experience.

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