Prime mover insurance cost depends less on the truck in isolation than on the operation it pulls: the combination it runs, where it runs, what it carries, who drives it and how the trailers are insured. There is no list price. Two identical prime movers can carry very different premiums because one runs a single trailer on metro distribution and the other runs a road train on remote linehaul. This guide sets out what underwriters look at for prime mover insurance, how semi-trailers are priced alongside it, and where operators have room to reduce the cost.
What Drives Prime Mover Insurance Cost
An underwriter pricing a prime mover is effectively pricing a combination and a route. These are the factors that move the number.
Combination Configuration
A prime mover with a single semi-trailer, a B-double and a road train are different risks even when the prime mover is the same. Longer and heavier combinations take longer to stop, need more room to manoeuvre and do more damage when something goes wrong. Multi-trailer combinations are also more exposed to rollover, trailer sway and coupling failures.
Disclose the configuration you run most often and the one you run occasionally. An operator who insures on the basis of single-trailer work and then runs a B-double for a seasonal contract has changed the risk.
Radius and Type of Operation
Metro distribution produces frequent low-speed incidents: reversing into docks, clipping awnings, kerb strikes in tight streets. Interstate linehaul produces fewer incidents, but they tend to be more severe, including high-speed collisions, fatigue-related run-offs and animal strikes at night.
Remote and outback work adds distance to every problem. Recovering a damaged combination and towing it hundreds of kilometres to a repairer can be a significant cost in itself, and some policies limit recovery and towing costs. Our article on transport insurance for remote operations covers those issues in more depth.
Freight Carried
Freight affects both the chance of an incident and the size of the loss. Dangerous goods, fuel, livestock, bulk grain, refrigerated product, steel coil, machinery and general freight all rate differently. Loads that move, such as livestock and liquids, raise rollover exposure. High-value loads raise theft exposure.
The freight itself is insured separately under goods in transit cover, explained in our guide to goods in transit insurance, but the nature of the freight still shapes the vehicle premium.
Drivers
Underwriters look at driver ages, licence classes, years of heavy combination experience, driving histories and how drivers are recruited and managed. Operators with documented fatigue management, driver training and telematics monitoring present better than those who cannot show how drivers are selected or supervised. Policies may carry additional excesses for drivers under a set age, drivers with limited experience or drivers who were not declared.
Agreed Value
Prime movers are commonly insured on an agreed value basis, which fixes the amount paid on a total loss. Setting the value too high increases the premium without adding real protection. Setting it too low leaves you short when it is time to replace the truck. Good used prime movers can hold their value when supply is tight, so the agreed value should be reviewed at every renewal rather than rolled over.
Downtime
A prime mover off the road stops revenue while finance repayments, wages and fixed costs continue. Some operators insure loss of income or the cost of hiring a replacement unit while the truck is repaired. That cover adds premium, but it addresses a risk that hits smaller operators hard: a truck in the workshop for weeks waiting on parts.
Claims History and Fleet Size
Claims frequency, the cause of each claim and what changed afterwards all matter. A single owner-driver is rated largely on their own record and experience. A larger operation is rated more on its systems, such as driver management, maintenance, telematics and incident reporting, and may be better placed on a fleet insurance policy that rates the operation as a whole.
How Trailers Are Insured Alongside the Prime Mover
A prime mover’s policy does not automatically cover the trailers it pulls. How the trailers are insured affects both the total cost and whether there are gaps. Our article asking whether your trailer is covered by your truck policy covers the basics. The cost implications are these:
- Owned trailers insured separately. Each trailer you own is listed with its own value and premium. This is the cleanest arrangement if you run your own trailers.
- Trailers owned by others. If you pull customers’ or hirers’ trailers, you may be responsible for damage to them. Trailer-in-control insurance covers trailers you do not own while they are coupled to your prime mover, usually up to a set limit per trailer.
- Mixed operations. Operators who run their own trailers and also pull others’ need both, with a trailer-in-control limit that matches the most valuable trailer they realistically pull.
Third party liability while a trailer is coupled usually runs through the prime mover’s policy. Check how the wording treats a trailer that is uncoupled and parked, because that is where liability questions tend to arise.
Semi Trailer Insurance Cost
Semi trailer insurance cost is driven by a different mix of factors from the prime mover, because a trailer has no engine and no driver of its own. Our semi trailer insurance page covers the cover itself. These are the factors that move the price:
- Trailer type and value. Flat tops, drop decks, curtainsiders, tippers, tankers, refrigerated vans, livestock crates and low loaders each carry different repair costs and exposures.
- Specialist components. Refrigeration units, tanker barrels, hydraulic tipping gear and ramps are expensive to repair. A refrigeration unit that fails mechanically has not been in a collision, so whether it is covered depends on the wording and any breakdown extension.
- Who pulls it. A trailer regularly coupled to subcontractors’ or hirers’ prime movers is outside your direct control, and the arrangements need to be disclosed.
- Uncoupled exposure. Trailers parked at depots, customer sites and drop yards are exposed to theft, vandalism and fire while no one is watching.
- Freight profile. Tipping trailers can roll on uneven ground. Tankers and livestock trailers carry surge risk.
- Agreed value and age. As with the prime mover, trailer values should be reviewed at each renewal.
How to Reduce Prime Mover Insurance Cost
- Disclose the operation accurately. An undisclosed configuration, route or freight type can create serious problems at claim time and saves nothing in the long run.
- Review agreed values at renewal against the current market for comparable trucks and trailers.
- Show your driver management, including recruitment checks, licence verification, training, fatigue management and telematics.
- Fit and use safety technology. Forward and driver-facing cameras, electronic braking and stability systems and telematics give underwriters evidence and help defend liability claims.
- Match trailer cover to reality. Insure owned trailers properly, set trailer-in-control limits to the trailers you actually pull and remove trailers you no longer own.
- Consider the excess. A higher excess can reduce the premium if your claims are infrequent and you can carry the excess comfortably.
- Look at the programme as a whole. Placing prime mover cover, trailers, goods in transit and liability together, on consistent information, reduces gaps and duplicated cover.
Common Questions
How much does prime mover insurance cost in Australia?
There is no list price. The premium depends on the combination, radius, freight, drivers, trailer arrangements, agreed value and claims history.
Does my prime mover policy cover the trailer?
Not automatically. Owned trailers usually need to be listed, and trailers owned by others need trailer-in-control cover.
Does a B-double cost more to insure than a single trailer combination?
Generally, because the combination is longer and heavier and exposed to more severe incidents. The extra trailer also adds value to insure.
Does the policy cover the freight I carry?
Not in any meaningful way. Freight is insured under goods in transit cover, which is arranged separately.
Talk It Through
Request a quote or call 1300 983 940 and we will look at your combinations, routes and trailers together so the cover matches how the trucks actually run.
General advice only. This article does not take your objectives, financial situation or needs into account. Consider the relevant PDS and Target Market Determination before deciding on a policy.