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Laurie Caruana is authorised by Queensland Transport as an Approved Person (certificate number MA1512) to certify modifications and alterations to light and heavy vehicles in accordance with the following codes.:
| Type | Code | Description |
| Light Vehicles | LH2 | Roof Conversion |
| LH4 | Modified Wheelbase Conversion | |
| LH7 | Body / Chassis Variants Conversion | |
| LH8 | ||
| LK1 | Seat and Seat Belt Installation / Removal | |
| LK6 | Child Restraint Anchorage Installation | |
| LS2 | LHD Vehicle Steering Conversion | |
| Heavy Vehicles | A2 | Air Cleaner Substitution or Additional Fitment |
| A4 | Exhaust System Alterations | |
| H1 | Wheelbase Extension Greater than 1st Manufacturer's Option | |
| H2 | Wheelbase Reduction 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 | ||
| J1 | Mounting of Body - Vehicles greater than 4.5 tonne GVM | |
| K1 | Seating Capacity Alteration and Seat Belt Alteration | |
| K3 | Cabin Conversion | |
| K5 | Wheelchair Restraint Installation | |
| K6 | Child Restraint Installation | |
| M1 | Fuel Tank Repositioning or Additional Fitting | |
| P1 | Tow Coupling Installation - Vehicle greater than 4.5 tonne GVM | |
| Q1 | Truck Mounted Crane Installation - 1.0 to 10 metre tonne capacity | |
| R1 | Goods Loading Device Installation - Non slewing | |
| R2 | Wheelchair Loader Installation | |
| S6 | Omnibus Evaluation | |
| T1 | Construction of Tow Trucks | |