VASS Engineer Melbourne – Truck & Heavy Vehicle Certification
Kadtec Engineering provides VASS engineering assessment and certification services for modified light and heavy vehicles throughout Victoria.
We assist vehicle owners, workshops, body builders and manufacturers with modifications requiring assessment against the applicable Australian Design Rules (ADRs), VSB 6, manufacturer requirements and Victorian vehicle standards.
Services
Our VASS services include assessment and certification for:
- Truck body, tray and tipper installations
- Tail lift installations
- Chassis modifications and extensions
- Fifth wheel and coupling installations
- Towbars and drawbars
- Structural vehicle modifications
- Axle load and vehicle stability assessments
- Vehicle dimensions, lighting and ADR compliance
Engineering calculations, 3D CAD modelling and Finite Element Analysis (FEA) can also be provided where required to substantiate the modification.

Truck & Heavy Vehicle VASS Certification
Kadtec Engineering provides VASS engineering inspections, assessments and certification for truck and heavy vehicle modifications throughout Melbourne and Victoria.
Our work is focused on commercial vehicles, truck bodies and structural vehicle modifications. We work directly with vehicle owners, truck body builders and fabricators to assess modifications against the applicable VSB6 and Australian Design Rule requirements.
Where required, Kadtec can assist from the design stage through to final inspection and VASS certification, helping to identify compliance issues before fabrication is completed.
VASS Modification Codes & Services
Kadtec Engineering can provide VASS assessment and certification for a range of truck and heavy vehicle modifications, including:
- J1 – Body installation and mounting
- J4 – Tipper body design
- R1 – Tail lift installation
- P1 – Towbar and towing equipment installation
- P2 – Fifth wheel and coupling installations
- H – Chassis and structural modifications
- Other applicable VSB6 modification codes within our VASS authorisation
Typical projects include truck trays and bodies, tippers, tail lifts, custom towbars, fifth-wheel installations, chassis modifications and other commercial vehicle modifications.
Our VASS Certification Process
The certification process will vary depending on the modification, but generally involves:
- Send us the vehicle and modification details, including drawings or photos where available.
- Kadtec reviews the proposed or completed modification against the applicable VSB6 and ADR requirements.
- Engineering calculations, drawings or FEA are completed where required.
- The vehicle is inspected after the modification is completed.
- Any required rectification items are identified and reviewed.
- VASS certification and the applicable documentation are completed once the modification is satisfactory.
Frequently Asked Questions
What modifications require VASS certification?
Many significant vehicle modifications require assessment by a VASS signatory before the vehicle can be accepted for registration or continued road use. The applicable requirements depend on the vehicle and the type of modification.
Can Kadtec certify a truck that has already been modified?
Yes. Existing modifications can be inspected and assessed. If the modification does not initially satisfy the applicable requirements, Kadtec can identify the engineering or fabrication changes required before certification.
Should I contact a VASS engineer before fabrication?
Where possible, yes. Reviewing the design before fabrication can reduce the risk of expensive changes being required after the vehicle has been completed.
What information should I provide?
Useful information includes the vehicle make and model, VIN or chassis details where available, a description of the proposed modification, drawings or dimensions, component specifications and clear photos.
Does Kadtec provide VASS certification for heavy vehicles throughout Victoria?
Yes. Kadtec Engineering provides VASS engineering services for truck and heavy vehicle modifications throughout Victoria, subject to the modification being within our authorised VASS codes.
