Australian Design Rules

Suspension Requirements
As applicable to trailed vehicles less than 4.5 tonne aggregate trailer mass

Note: For more detailed information pleasecontact your nearest AL-KO State Branch.

SUSPENSION

Within a group of axles:

• two axles must not be more than 2 metres apart;
• three axles must not be more than 3.2 metres apart overall.

All axles in a group must be interconnected by a loadsharing group and the wheels and tyres fitted to it is:

• at least 120% of the load on that axle with the trailer at its ATM; and
• at least equal to the load on that axle with the trailer at its ATM and any retractable axle retracted.

Note: A close coupled axle group is where the two axles in a group have their centres not more than one metre apart, or three axles not more than 2 metres apart, or three or more axles not more than 3.2 metres apart.

Note: This information is a guide only. We suggest customers contact the Department Of TransportAnd Regional Services (D.O.T.A.R.S.) in Canberra for specific advice pertaining to Australian Design Rules.

SPRINGS AND SPRING SETS

AL-KO provides a large range of leaf springs for use on trailers and caravans under all types of conditions and loads.

AL-KO staff will assist you with the appropriate selection of the spring system best suited to your needs and the load you expect to carry.

Most AL-KO springs are given a load rating at a deflection of 50mm.

To make selection of your spring set easy and to ensure you receive exactly what you need, the selection of the combination of parts to provide you with a complete spring set is made up of three parts.

1. Select the spring type and size best suited for your application. Note the spring capacities shown are for two springs.
2. Select the “hanger kit” that suits the springs, where these are not included.
3. Select the “u-bolt kit” that matches the spring and axle configuration.

These three part numbers will ensure you are provided with the most appropriate combination to suit your needs. AL-KO staff will assist, when requested, with any selection criteria.