RoRo, container or break-bulk: how semi-trailers actually get shipped
Buyers negotiate hard on the trailer price and then accept the first freight quote they are given. That is the wrong way round. On a single trailer to West Africa, the difference between the cheapest and the most expensive shipping method can approach the margin you just argued over.
There are three ways a semi-trailer crosses an ocean. Each suits a different order.
RoRo — rolled on, rolled off
The trailer is towed onto a vehicle carrier and secured on a deck, the same way a car is.
Suits: single units and small quantities, destinations with a RoRo terminal, buyers who want the trailer ready to work the day it lands.
Watch for: RoRo services run on fixed routes and fixed schedules, and to fewer ports than container lines. If your port has one sailing a month, that schedule — not the factory — becomes your lead time. Rates are quoted per cubic metre or per unit and are sensitive to how much deck space the trailer’s height takes.
The advantage people undervalue: nothing is dismantled, so nothing has to be reassembled correctly at the far end. For a first order from a new supplier, that removes a whole category of risk.
Container — partly knocked down
The trailer is dismantled far enough to fit inside a 40-foot container. Typically the suspension and axles come off, the deck is separated from the chassis, and the parts are stacked and braced.
Suits: multiple units to the same port, destinations with no RoRo service, and buyers with a workshop that can reassemble.
The economics: the saving only appears at quantity. Fitting two or three trailers’ worth of components into one container is where this method earns its keep. For a single unit it rarely beats RoRo once you add the dismantling labour at our end and the assembly at yours.
Watch for: reassembly is real work — several days with lifting equipment for a competent workshop. Ask yourself honestly whether the crew at the destination can do it, because a badly reassembled suspension is dangerous rather than merely inconvenient. Ask us for the assembly drawings before you commit to this method, not after the container lands.
Break-bulk and flat rack — lifted on
The trailer is craned onto the vessel as general cargo, or secured to a flat-rack container.
Suits: lowbeds and anything over-width or over-height that will not fit a container and is awkward for RoRo. Also common for large fleet orders where a shipper charters space.
Watch for: handling charges at both ports, and the need for a crane at destination. Rates are more negotiable than RoRo but the schedule is less predictable.
What actually decides it
Four questions, in this order:
- How many units? One or two — usually RoRo. Four or more to the same port — price the container option seriously.
- Does your port have a RoRo terminal, and how often does it sail? This eliminates options faster than anything else. Lagos, Tema, Mombasa, Dar es Salaam, Jebel Ali and Durban are all well served. Smaller ports often are not.
- Can the receiving end reassemble? If not, container shipping is a false economy no matter what the freight quote says.
- How tall is the trailer? RoRo pricing is driven by deck space. A tipper with a high body can cost noticeably more to ship than a flatbed of the same weight.
The mistake that costs the most
Choosing the method after the trailers are built.
Whether a trailer will travel in a container changes how we build it — which joints are bolted rather than welded, where the lifting points go, how the wiring is routed so it can be separated without cutting. Deciding at the end means either shipping RoRo at whatever the rate is that month, or paying for modifications that should have been designed in.
Tell us the destination port and the quantity at enquiry stage. It costs nothing then and it is the single cheapest decision in the whole transaction.
What to send us for a freight comparison
- Destination port, not just the country
- Quantity and whether it may grow
- Whether you want FOB, CFR or CIF quoted
- Whether the receiving end has a workshop and lifting equipment
- Any inland leg after the port, since that can rule out an over-height configuration
We will price the realistic options side by side, including the one that is cheaper for you and smaller for us.