Matching a Trailer to Your Truck: Combinations That Work
Trailers are bought on price and body type and then discovered to be wrong on ratings. What has to match, what does not, and the checks to do before you commit.
A trailer is only as useful as the combination it forms. Buyers get this wrong in a predictable way: they choose the trailer for the freight and then find the prime mover is not rated for it, or that the combination is legal but useless once loaded.
What has to match
- GCM. Your prime mover's Gross Combination Mass must cover the trailer plus its payload plus the truck. This is the constraint that stops a purchase dead, and it is on the compliance plate.
- Coupling. Fifth wheel height and rating, kingpin type, and turntable height against the trailer's. A mismatch here is not always obvious in a yard.
- Brakes and air. Compatible air system and connections, and an ABS or EBS system the truck can talk to.
- Suspension type. Airbag on the trailer with airbag on the truck rides very differently from a mixed combination, and it matters for fragile freight.
- Axle spacing and combination length, which determine what mass limits you can access and whether you are legal on your route.
Body types and what they are actually for
| Type | Suits | Watch for |
| Tautliner / curtain-sider | General freight, pallets, side loading | Curtain condition, gate straps, floor |
| Flat top | Steel, machinery, awkward loads | Deck condition, tie-down points, twist locks |
| Drop deck | Higher loads within height limits | Ramp condition if fitted, deck height vs your work |
| Low loader / float | Machinery transport | Ramps, widening gear, axle group rating |
| Tipper | Bulk — quarry, grain, spoil | Body wear, hoist, tailgate seal, chassis fatigue |
| Skel | Containers only | Twist lock condition, correct length for your containers |
| Refrigerated | Temperature-controlled freight | Fridge hours and service history, panel integrity, seals |
| Dog trailer | Rigid truck combinations | Drawbar, coupling rating, whether your truck is rated |
What to inspect on a used trailer
Trailers look simple and hide expensive problems in three places.
- Chassis and crossmembers — cracks around suspension hangers and the kingpin plate. This is the expensive one and often the reason for sale.
- Suspension and axles: airbag condition, ride height sitting level, bearing play, and brake lining on every wheel.
- Tyres, including date codes. A trailer set is a significant cost and old tyres with tread are still old tyres.
- Floor, on anything that carries a forklift. A soft floor is a major repair.
- On a refrigerated trailer: the fridge unit hours and service history, which can be worth more than the trailer.
- Compliance plate, VIN matching the papers, and a PPSR search before payment.
The combination questions worth answering first
- What is my prime mover actually plated for?
- What mass limits does my route allow, and does this combination access them?
- Can I turn this combination around where I load and unload? Legal and impossible is a real outcome.
- What is the tare weight? Every kilogram of trailer is a kilogram of payload you never carry.
- Am I buying for the freight I have, or the freight I hope to have? Both are valid — be clear which.
Trailers currently listed
Recently listed trailers
Read from our index on 30 September 2026 · 427 matching listings · median asking price $77,000 · $15,950 to $660,000
Trailers by price
Read from our index on 30 September 2026 · 427 matching listings · median asking price $77,000 · $15,950 to $660,000
Common questions
What do I need to check before buying a trailer for my truck?
Your prime mover's GCM rating first — it must cover the trailer plus payload plus the truck. Then coupling compatibility (fifth wheel height and rating, kingpin, turntable height), air and brake system compatibility, suspension type, and whether the combination length and axle spacing are legal and useful on your route.
What is the most expensive problem on a used trailer?
Chassis cracking, particularly around the suspension hangers and the kingpin plate. It is a major structural repair and is frequently the real reason a trailer is for sale. Inspect these areas closely and be suspicious of fresh paint in those specific spots.
Does trailer tare weight matter?
Considerably. Every kilogram of trailer is a kilogram of payload you cannot carry, for the entire life of the trailer. On high-volume work a lighter trailer with the same rating pays for itself in extra payload per trip.
Looking for something specific?
Search live stock from Australian dealers, or work out what a repayment looks like before you start.