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Heavy Vehicle Modification Codes

Specific Modification Information – Heavy Vehicle - see below:- 

A1 – Engine substitution
A2 – Air Cleaner Substitution or Additional Fitment.
A4 – Exhaust System Alterations.
B1 – Transmission Substitution or Additional Fitment
C1 – Tail shaft Alterations
D1 – Rear axle/s Installation
D2 – Differential Substitution
E1 – Front Axle Installation
E2 – Steering System Alteration
E3 – Fitting of non-standard front wheel rims and tyre componentry
F1 - Suspension Substitution(heavy vehicle)
F2 - Trailer Suspension Modification
G1 – Air Brake System – Repositioning of Controls, Valves and Pipework
G2 – Fitting of Trailer Brake 10 plus Connections & Controls on Prime Movers
G3 – Trailer Brake System Upgrading
G4 – Brake System Certification
G5 – Auxiliary Brake System Installation
G6 – Air Operated Accessories
G7 – Brake System Substitution
G8 – Trailer Brake System Upgrade
H1 – Wheelbase Extension greater than 1st Manufacturer’s Option
H2– Wheelbase Reduction less than 1st Manufacturer’s Option
H3 - Wheelbase Extension/Reduction less than 1st Manufacturer’s Option
H4 – Chassis Frame Alteration other than Change in Wheelbase
H5 – Trailer Chassis Frame Modification
J1 – Mounting of Body – Vehicles of greater than 4.5 tonne GVM
K1  – Seating Capacity Alteration & Seat Belt Installation
K2 - Seat Anchorage Certification & Seat Belt Anchorage Certification
K3 – Cabin Conversion
K6 - Child Restraint Anchorage Installation.
M1 – Fuel Tank Repositioning or Additional Fitting
P1 - Tow coupling installation - Vehicles over 4.5t
P2 - Fifth wheel and kingpin installation 
R1 – Goods Loading Device Installation
S1 - Gross Vehicle Mass and Gross Combination Mass Rating within Manufacturers Specifications
S2 - Gross Vehicle Mass Rating for Non Standard Vehicles
S3 - Gross Combination Mass Rating
S4 – Rigid Omnibus Mass Rating
S5 – Articulated Omnibus Mass Rating
S6 – Omnibus Evaluation
S7 – Aggregate Trailer Mass Rating
S8 - Road Train prime mover rating
S9 - B-double rating 
S10 – Concessional Livestock Loading Vehicle Rating
S11 – Road Train Trailer Rating
S12 – Aggregate Trailer Mass Rating for Non Standard Trailers
S13 – Bus Life Vehicle Rating
T1 - Construction of Tow Trucks
T2 – Design of Tow Trucks
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Specific Modification Information – Heavy Vehicle

Below is some further information on specific heavy vehicle modifications that we regularly engineer. 

If the information you require is not on the website please contact us.

Federal Compliance Plate Approval – IPA

Heavy Trailer ATM Rating

Lazy axle fitment

Truck GVM upgrades / downgrades

Campervans and Motorhomes

Seating and Seat belts

Machine / Earth moving equip brake testing AS 2958 and ISO 3450

Noise Testing

Seat Testing to ADR 

Federal Compliance Plate Approval – IPA

Heavy Trailer OD (Over Dimension) Compliance and Registration Summary / Procedure

This is a summary of the required Qld state and federal procedures and sequence for import, compliance and registration of a new oversize / excess mass heavy trailer / machines.  Heavy trailers are ATM greater than 4.5t.

1.0   Assessment – before the trailer is purchased / imported it is advised that the mass and dimensions are assessed to ADR and state regulations to check that trailer will be able to be registered.

2.0   In principal to register” approval by Qld Transport is an assessment procedure that will provide an ‘in principal’ approval letter as assessed by Qld Trans engineers.  Trailer is assessed to excess mass and over dimension guidelines.

3.0   Import approval must be obtained from DIT (Dept of Transport and Infrastructure – federal) before trailer is landed in Australia.  To obtain Import approval the machine must have:-

-  Manufacturer allocated VIN

 - “In principal to register” from Qld Trans or other state

 4.0  Once trailer is landed it is inspected and weighed (supervised weigh) by Qld Trans to ensure quoted masses are correct.

 5.0   Trailer is also inspected by compliance engineer to ADRs and required modifications for compliance are advised. HVRAS form (Heavy Vehicle Registration Assessment Scheme) is completed by compliance engineer – this checks vehicle on road dimensions.

 6.0  Application for IPA (Identification Plate Approval) can now be submitted by compliance engineer to DIT – federal government.  This is federal approval of ADR compliance.

 7.0  Once IPA is granted identification plate (or compliance plate) is ordered from Niddrie Nameplates and affixed to vehicle in nominated position.  Any number of identical trailers can now be fitted with an identification plate using this approval no.

 8.0  Permit to Operate is then obtained from Qld Trans for oversize / excess mass trailer.

 9.0  Vehicle can now be registered with Qld Transport and must be used in accordance with any Qld Trans Permit to Operate conditions.

 10.0  For subsequent trailers being imported that are identical to this first one – all above steps except 6.0 are required for registration.  Please note identical trailers must have the same number of axles, axle type, suspension type, brake system type otherwise they are new trailers or new variants and step 6.0 will be required. 

Heavy Trailer ATM Rating

 Rating of pre ADR (1988) heavy trailer ATM can be done by DB Autotech as now required by Qld Transport.  To allow ATM rating the following modification codes must be done:-

G3 – Trailer Brake System Upgrading

S7 – Aggregate Trailer Mass Rating

S12 – Aggregate Trailer Mass Rating for Non Standard Trailers 

Lazy axle fitment

Truck GVM upgrades / downgrades

Truck GVM cannot be altered solely for the purposes of cheaper registration, car license usage or increased payload.

Qld Transport stipulates that the GVM must be up/down graded to the next manufacturer GVM option and the vehicle must be physically modified to the specification of that next GVM option vehicle. 

This regulation excludes campervans/motorhomes that are allowed to be GVM downgraded to allow them to be driven on a car license (under 4.5t GVM).

The fitment of a lazy axle to a truck to increase the GVM must be in line with a factory variant of truck fitted with a lazy axle – ie: the specification of the upgrade parts and proposed GVM is in line with the factory lazy axle variant.

To correctly comply a lazy axle fitment several codes are required to ensure complete compliance – as required:-

C1 – Tail shaft Alterations

D1 – Rear axle/s Installation

F1 - Suspension Substitution(heavy vehicle)

G4 – Brake System Certification

H1 – Wheelbase Extension greater than 1st Manufacturer’s Option

H2– Wheelbase Reduction less than 1st Manufacturer’s Option

H3 - Wheelbase Extension/Reduction less than 1st Manufacturer’s Option

S1 - Gross Vehicle Mass Rating within Manufacturers Specifications

S2 - Gross Vehicle Mass Rating for Non Standard Vehicles

S3 - Gross Combination Mass Rating 

Campervans and Motorhomes

Please see link to federal “Certification of campervans and motorhomes Circular 0-4-12” in the Contact Us page.

Qld Transport have introduced new criteria for a vehicle to registered as a motorhome / campervan:-

  • Living space cannot be detachable
  • Cannot contain space for transport of goods – ie: car, horses
  • Living space must be accessable from cab
  • Fixed table (or removeable)
  • No. fixed seats equals / exceeds no. sleeping berths
  • Permanent - cooking facilities
  • Permanent - storage facilities – cupboards, etc.
  • Fire extinguisher
  • Outward facing opening or sliding door on LH side or rear of vehicle

Other items that may require a modification plate are:-

  • Poptop campers, fitment of doors or other body modifications require a K3 code for cabin conversion.
  • Seating capacity reduction / increase requires a LK1 code.
  • Fitment of new seats will require a LK1/LK2/LK6 code.

It is allowed for campervans and motorhomes to have their GVM downgraded to allow them to be driven on a car license (under 4.5t GVM). 

Seating and Seat belts

All seating, seat belt and child restraint modifications must use approved parts:-

  • Seats must comply with ADR 3 or VSB 5a/b – see links in “Contact Us”
  • Seat belts must comply with ADR 4, AS 2596, E, ECE, EEC marked.
  • Child restraints and anchorages must comply with ADR5, ADR 34

Mounting of seats, seat belts and child restraint anchorages must be in accordance with vehicle codes of practice – please contact us for information.

DB Autotech can design and test seats to VSB 5a/b (National Codes of practice for seat manufacture - see links in “Contact Us”).  In the past we have designed, tested and approved folding seats in the back of prime mover cabs and passenger vehicles.

Machine / Earth moving equip brake testing AS 2958 and ISO 3450

DB Autotech has done brake testing and certification on various Earth moving equipment (graders, excavators) to Australian Standards AS 2958 and ISO 3450.  Our brake testing equipment is compliant with ISO 9248 as required and we can provide test data or a complete compliance report as required.  Test equipment is portable and testing can be performed at any location required. 

Noise Testing

DB Autotech has noise testing equipment that is compliant with IEC 651 Type II and we can provide test data or a complete compliance report as required.  Testing can be performed on any vehicle or machine. Test equipment is portable and testing can be performed at any location required.

Seat Testing to ADR

DB Autotech can perform all static seat, seat belt anchorage and head restraint testing as required by VSB 5 (ADR 3, 5 and 22).  We can provide test data or a complete compliance report as required.

email: David Blythe

DB Autotech * Salisbury * QLD * 4107
 Business Hours - 9am - 4pm - Monday - Friday

 Phone : 0407 756 870