Ask for “a trailer” and every operator will send one. Whether it is the right one shows up later — as overhang you did not plan for, a permit you did not file, or a load path that stresses cargo it should never stress. Length is the first spec we settle on any booking. Here is the logic, so you can sanity-check any quote you receive.
The four questions that decide length
1. How long is the cargo — really?
Not the machine’s spec-sheet length: the transport length, including buckets, booms, counterweights and anything that protrudes once the machine is in travel position. A 14-metre excavator with the boom cradled is not a 14-metre load if the stick extends past the deck line. Measure the configuration that will actually sit on the trailer.
2. Where does the weight sit?
A short, dense load — a press, a transformer — concentrates weight and needs axles under it, which can favour a shorter deck with more axle lines rather than a longer one. A long, comparatively light load — structural steel, tower sections — needs support along its length to prevent it flexing over an unsupported span. Same tonnage, opposite trailers.
3. What do the overhang rules say?
Cargo extending past the deck is regulated: modest overhang must be marked and flagged; significant overhang reclassifies the move as an abnormal load with permits and possibly escorts attached (thresholds and process in our permits guide). The economics often flip here — a 24-metre trailer at standard rates beats an 18-metre trailer plus abnormal-load process.
4. Can the route take the combination?
Longer combinations sweep wider through roundabouts, interchanges and site gates. A 30-metre trailer solves the cargo problem and creates a geometry problem — which is why long-load routes get swept-path checks during the survey. Inside tight industrial areas, the last 500 metres decides more than the highway does.
Rules of thumb by length
- 12–13.5 m — the workhorse band: standard plant, containers, general machinery. Fastest to book, no length drama.
- 15–18 m — larger single machines, mid-length steel, equipment with fixed attachments that stretch the transport length.
- 24 m — long structural elements, bundled pipe, multi-piece consignments consolidated on one deck; comfortably supports loads that would overhang shorter decks.
- 30 m / extendable — genuinely long indivisible cargo: bridge beams, long vessels, tower sections — the class of work where wind-blade logistics lives. Almost always surveyed, often permitted.
Length pairs with configuration — ramps, drop deck, extendable, dolly — which our lowbed types guide covers, and the full range of lengths and configurations is on the fleet page.
What to send with your enquiry
Transport length, width, height, weight, and a photo if the shape is unusual. From that we confirm length, configuration and whether the move is standard or permitted — before anything is booked, not after. Send your cargo specs here.
One principle above all: the trailer serves the cargo, not the other way round. Any quote that names a trailer before asking your dimensions is guessing — and on heavy cargo, guesses are expensive.