3 Vehicle structure
Reasons for rejection
1. The structure of the vehicle (shaded areas of Figure 3-1-2) has visible:
a) deformation from the original shape that has affected the vehicle’s structural integrity (Note 2), or
b) cracking (Note 3) (Figure 3-1-3), or
c) fracture, or
d) corrosion damage (Note 1) that is individually larger than 50mm in diameter (Figure 3-1-1), or
e) any corrosion that the inspector considers has caused weakening of the load-bearing structure, or
f) poor repairs (Note 1) that have not returned the structure to within a safe tolerance of when it was manufactured (Note 2), such as:
i. filler has been used in an attempt to conceal corrosion damage or deformation of a component, or
ii. a high strength steel component has been heated.
2. A hinge for a panel is not securely attached to both the vehicle body and to the door or other hinged panel due to loose connections, corrosion or other damage.
3. There is corrosion damage within 150mm of the hinge of a hinged panel (Figure 3-1-4).
4. There is corrosion damage within 150mm of the latch of a hinged panel (Figure 3-1-4).
5. A hinged panel does not remain secure in a closed or locked position.
6. The trailer is an unrepaired Trailpro 8x4 Tradesman (model number TP5) or a Trailpro 8x5 Tandem (model number TP8), with a bolt-through drawbar attachment (these trailers are subject to safety recall) (Note 4). See Figure 3-1-5 for advice on identifying these trailers. See Figure 3-1-6 and Figure 3-1-7 for advice on identifying repaired Trailpro trailers.
Corrosion damage is where the metal has been eaten away, which is evident by pitting. The outward signs of such corrosion damage is typically displayed by the lifting or bubbling of paint. In extreme cases the area affected by the corrosion damage will fall out and leave a hole.
Repair means to restore a damaged or worn vehicle, its structure, systems, components or equipment to within safe tolerance of its condition when manufactured, including replacement with equivalent undamaged or new structures, systems, components or equipment.
The vehicle inspector may request additional relevant information from a repairer or other relevant person.
Special attention should be given to the point or points where the drawbar attaches to the body of the trailer. This is often the first point of structural failure on trailers.
The NZ Transport Agency is aware of a safety risk with the Trailpro brand of light trailers which were sold through Bunnings NZ between 1 January 2006 and 12 October 2018. The TP5 has a single axle and a tray size of 8'x4' (2.4m x 1.2m). The TP8 is a tandem axle model with a tray size of 8'x5' (2.4m x 1.5m). Other models, such as the TP1 and TP6 are not included in the recall and have a smaller tray size. More information can be found in the safety recall notice on the Transport Agency website.
Repaired trailers are identified by an ‘R’ after the serial number (Figure 3-1-6).
Figure 3-1-1. Corrosion damage 50mm diameter limit
Figure 3-1-2. Shaded areas referred to in ‘Condition’ above
These include chassis, cross members and subframes, load-bearing monocoque body structures, body mounts, and the body on a trailer with a separate chassis. Other sections also contain reasons for rejection and diagrams relating to specific vehicle components.
Figure 3-1-3. Drawbar attachment to trailer
Figure 3-1-4. Hinge and latch anchorages
No corrosion damage is allowed within 150mm of a circle around the outside of hinge or latch components.
Figure 3-1-5. Identifying a Trailpro TP5 and TP8
Bunnings is currently working on a repair process and we will update this once that is in place.
Affected trailers are fitted with an identification plate which is located on the outside of the trailer drawbar near the tow coupling.
Location of the trailer identification plate
Identification plate similar showing model number
The identification tag may be missing, faded, damaged or obscured. All Trailpro models have drawbars that are bolted rather than welded to the trailer. The TP5 has a single axle and a tray size of 8'x4' (2.4m x 1.2m). The TP8 is a tandem axle model with a tray size of 8'x5' (2.4m x 1.5m). Other models, such as the TP1 and TP6 are not included in the recall.
Bolted through drawbar attachment to trailer
Broken drawbar (sitting on trailer)
Figure 3-1-6. Trailpro plate showing repaired status
Figure 3-1-7. New front mount of the repaired Trailpro 8x4 and 8x5 trailers
Summary of legislation
- Land Transport Rule: Vehicle Standards Compliance 2002, section 7.4
- Traffic Regulations 1976: regulation 80.
1. A trailer may be fitted with hinged panels.
2. A vehicle must:
a) not be so affected by corrosion or weakening of its structure, that is apparent by visual examination, so that the vehicle is unsafe to operate, and
b) be safe to be operated, and
c) have been constructed using components and materials that are fit for the purpose, and
d) be within safe tolerance of its state when manufactured or modified.
Page amended 1 June 2019 (see amendment details).
- General vehicles
- Heavy vehicles
- Light PSVs
- Heavy PSVs
- General trailers
- Heavy trailers
- Unclassified vehicles
- Technical bulletins (general)
- Technical bulletins (CoF)
- Interim amendments