| Engine Modifications (Code A) | |
| A1 | Engine Substitution |
| A2 | Air Cleaner Substitution or Additional Fitment |
| A3 | Turbo Charger Installation |
| A4 | Exhaust System Alterations |
| Transmissions (Code B) | |
| B1 | Transmission Substitution or Additional Fitment |
| Tail Shaft (Code C) | |
| C1 | Tail Shaft Alterations |
| Rear Axle (Code D) | |
| D1 | Rear Axle Installation |
| D2 | Differential Substitution |
| Front Axles Steering and Wheels (Code E) | |
| E1 | Front Axle Installation |
| Suspension (Code F) | |
| F1 | Suspension Substitution |
| F2 | Trailer Suspension Modification |
| Brakes (Code G) | |
| G1 | Air Brake System - Repositioning of Controls, Valves & Pipe work |
| G2 | Fitting of Trailer Brake 10 plus Connections & Controls on Prime Movers |
| G3 | Trailer Brake System Upgrading |
| G5 | Auxiliary Brake Installation |
| G6 | Air Operated Accessories |
| G7 | Brake System Substitution |
| Chassis Frame (Code H) | |
| H1 | Wheelbase Extension greater than 1st Manufacturer's Option |
| H2 | Wheelbase Extension less than 1st Manufacturer's Option |
| H3 | Wheelbase Extension or Reduction within 1st Manufacturer's Option |
| H4 | Chassis Frame Alteration other than Change in Wheelbase |
| H5 | Trailer Chassis frame Modification |
| Body Mounting (Code J) | |
| J1 | Mounting of Body - Vehicles greater than 4.5 tonne GVM |
| Cabin (Code K) | |
| K1 | Seat capacity Alteration & Seat Belt Alteration |
| K3 | Cabin Conversion |
| K5 | Wheelchair restraint Installation |
| K6 | Child restraint Installation (Stand-alone Queensland Code) |
| Fuel Systems (Code M) | |
| M1 | Fuel Tank repositioning or Additional Fitting |
| Tow Couplings Fifth Wheels (Code P) | |
| P1 | Tow Coupling Installation Vehicle greater than 4.5 tonne GVM |
| P2 | Fifth Wheel and King Pin Installation |
| Truck Mounted Lifting Systems Slewing (Code Q) | |
| Q1 | Truck Mounted Crane Installation 1.0 to 10 meter tonne capacity |
| Vehicle Mounted Lifting Systems - Non Slewing (Code R) | |
| R1 | Goods Loading Device Installation |
| R2 | Wheelchair Loader Installation |
| Vehicle Rating (Code S) | |
| S1 | GVM Rating and GCM Rating to S2 or S3 approved design or within Manufacturer's Specifications |
| S6 | Omnibus Evaluation |
| S7 | Aggregate Trailer Mass Rating to S12 approved design or within Manufacturer's Specification |
| S10 | Concessional Livestock Leading Vehicle Rating |
| Tow Trucks (Code T) | |
| T1 | Construction of Tow Trucks |