Light vehicle mod plates
Assessment and certification for eligible modifications to passenger vehicles, utilities, vans and light commercial vehicles.
Queensland modification codes
Queensland vehicle modifications
Vehicle mod plates & automotive certification in Townsville
Vehicle modification assessment, Queensland mod plates and engineering certification for 4WDs, light vehicles, trailers, caravans and heavy vehicles across the Townsville region.
Mod plates Townsville
Ayr & Ingham service
Prompt assessment
Real vehicle projects
Engineering advice, assessment and certification
Approved PersonQueensland vehicle modifications
RPEQ MechanicalRegistered professional engineer
20+ yearsHeavy-industry experience
North QueenslandTownsville, Ayr & Ingham
Townsville & regional service
Prompt vehicle modification assessments across Townsville, Ayr and Ingham.
John is a Townsville-based mechanical engineer providing automotive certification and mod plate services for eligible light and heavy vehicle modifications. Enquiries are also welcome from Ayr, Ingham and surrounding North Queensland areas.
Fast response, subject to availability.
Initial enquiries are reviewed promptly, and short-notice inspections may sometimes be possible. Timing depends on the vehicle, modification, location and engineering evidence required.
TownsvilleAyrInghamNorth Queensland
Need a caravan ATM upgrade? View caravan engineering
Get the pathway right
Talk to an engineer before committing to the modification.
Certification requirements depend on the vehicle, the modification and the applicable Queensland code. An early review can identify the right pathway, the evidence required and any design or inspection issues before unnecessary work is completed.
- Advice on whether the proposed modification may be certifiable
- Identification of the relevant inspection and evidence requirements
- Engineering review of completed or proposed modification work
- Certification and mod plating when the work is found compliant
Automotive certification services
Townsville vehicle modification certification, explained in plain English.
Rather than expecting owners to know a code number, the enquiry starts with what has changed—or what you are planning to change.
4WD & GVM upgrades
Engineering review of eligible suspension and mass-rating changes, including the components and evidence needed for certification.
GVM upgrades from $880Seating changes
Assessment of eligible seat removals, additions and seating-capacity changes, together with restraint and occupant-safety requirements.
Seating & restraintsBody & chassis modifications
Engineering support for eligible chassis changes, cab or body alterations, mounting changes and structural vehicle modifications.
Structural assessmentBrakes & towing
Assessment of eligible brake-system changes, towbar and coupling installations, gooseneck arrangements and towing-related modifications.
Towing systemsHeavy vehicle certification
Engineering assessment and certification support for eligible heavy-vehicle modifications within the applicable accreditation scope.
Heavy vehicles & trailers
Broad engineering capability
One clear enquiry point for a wide range of modifications.
The detailed accreditation list is extensive. On the website, it is grouped around the way vehicle owners actually describe the work they need.
01Engine, transmission & driveline
02Suspension, steering & brakes
03Body, chassis, seating & towing
How it works
Start with the vehicle details and your proposed modification.
John can review the initial information before confirming the likely certification path, inspection requirements and next step.
Send the details
Provide the vehicle make, model, year, photos and a clear description of the proposed or completed modification.
Confirm the pathway
John reviews the information and identifies the likely code, supporting evidence and inspection requirements.
Inspect the vehicle
The vehicle and completed work are inspected against the relevant requirements and engineering considerations.
Certify compliant work
When the modification is eligible and found compliant, the appropriate certification and mod plate can be completed.
Starting prices
Clear entry points for common enquiries.
Final pricing depends on the vehicle, modification, location and level of engineering work required.
Starting from, including GST. Suitable for straightforward eligible modification and seating enquiries.
Starting from, including GST. Vehicle details and the proposed configuration are reviewed before booking.
Starting from, including GST. See the dedicated caravan page for the assessment information required.
Vehicle & trailer projects
Engineering across a range of vehicles and trailers.
A selection of vehicles and trailers from Rozis Engineering's project photo collection. Each assessment is specific to the vehicle, proposed modifications and supporting evidence.
Caravan owners
Looking for an ATM or GTM upgrade?
There is a dedicated page for caravan and trailer owners, with the required photo checklist, upgrade process and a focused assessment form.
View caravan upgrades
Common questions
Before requesting an assessment.
A few details and photos are usually enough to start a useful conversation about the certification path.
Do I need a mod plate?
That depends on the vehicle and the modification. Send the details before work begins where possible, so John can identify whether certification may be required and what pathway applies.
Can completed modifications be certified?
Sometimes, but certification cannot be assumed. The work, materials, evidence and final vehicle must satisfy the applicable requirements. Extra inspection or rectification may be needed.
What should I include with my enquiry?
Provide the make, model, year, VIN or compliance details, clear photos of the vehicle and modification area, and a description of what has changed or is proposed.
Does the starting price include parts or fabrication?
The displayed amounts are starting prices for the relevant engineering service. Any required parts, fabrication, travel or additional engineering work would be confirmed separately.
Do you provide mod plate inspections outside Townsville?
Enquiries are welcome from Ayr, Ingham and surrounding North Queensland areas. Regional or on-site availability depends on the location and modification, so include your town or suburb when requesting an assessment.
Request an assessment
Tell us what has changed.
Upload a few clear photos and describe the proposed or completed modification. John can review the information and contact you about the appropriate next step.