Truck and Trailer Types for International Freight: 7-Type Guide
Truck and trailer types explained: curtain-sided, flatbed, reefer, tanker, lowbed and container chassis, with limits and tips on how to choose.
Truck and trailer types for international freight fall into a few main groups: curtain-sided (tent) semi-trailers, flatbeds, refrigerated trailers, tankers, lowbeds and container chassis. The right choice depends on the cargo, its size and weight, and the rules on your route. A wrong match costs time at loading and sometimes at the border.
Many shippers book "a truck" without saying which one. That leads to rebooked vehicles and damaged goods. This guide explains the main truck and trailer types, their typical limits and how to choose between them. Royan Logistic is a Tehran-based company that arranges road freight, full and part loads, refrigerated transport and project cargo.
The main truck and trailer types at a glance
The table shows the types we see most often on international routes. Figures are typical, not guaranteed.
| Type | Best for | Watch out for |
|---|---|---|
| Curtain-sided (tent) semi-trailer | Palletized and boxed general cargo | Side loading needs free space |
| Flatbed or platform | Steel, machinery, long items | Needs tarps, lashing and edge protection |
| Refrigerated trailer | Fresh and frozen food, medicines | Temperature setting and ATP certificate |
| Tanker | Liquids and bulk powders | Cleaning record, dangerous-goods rules |
| Lowbed (low loader) | Tall or heavy machinery | Route permits and height limits |
| Container chassis | 20 ft and 40 ft containers | Axle weight with a loaded container |
| Tipper | Loose bulk such as sand or ore | Not for packaged or sensitive goods |
Curtain-sided trailers: the default choice
The curtain-sided semi-trailer is the workhorse of international road freight. A typical unit is about 13.6 m long and about 2.45 m wide inside. Operators typically quote 33 to 34 Euro pallets and a payload of roughly 24 to 25 t, but the real figure depends on the tractor and local axle rules.
The curtain opens at the sides, so a forklift can load from the side or the rear. The roof is soft, so you cannot crane-load from above unless the trailer has a sliding roof. A curtain offers less protection than a hard-sided box, so pack high-value goods carefully and insure them.
For most palletized export cargo, this is the simplest of the truck and trailer types. Bookings for full truckload (FTL) usually start from it. For smaller consignments, compare it with groupage (LTL).
Special truck and trailer types for heavy, cold or liquid cargo
Some cargo needs a purpose-built trailer.
- Flatbed: open platform for steel, pipes and machinery. Lashing points, tarpaulins and corner protectors matter here.
- Lowbed: a low deck for tall, heavy or out-of-gauge machinery. Oversize moves often need permits. See our project cargo page.
- Refrigerated trailer: insulated body with a cooling unit. The ATP agreement, drafted in Geneva in 1970, governs equipment for perishable food. An ATP certificate is first issued for up to six years and can be renewed after the equipment is tested. Read more in Refrigerated Transport from Iran.
- Tanker: for liquids and powders. Dangerous goods need ADR-qualified equipment and drivers.
Dimensions and weight limits: why the route matters
A trailer that is legal in one country may be too heavy or too tall in another. As a reference, EU Directive 96/53/EC sets these maximums for international road traffic:
- Articulated vehicle length: 16.50 m.
- Width: 2.55 m, or 2.60 m for refrigerated bodies.
- Height: 4.00 m.
- Gross weight: 40 t for a five- or six-axle articulated vehicle, with higher limits for some combined transport.
Iran, Turkey, Central Asia and Russia apply their own limits and permit rules. Axle loads and seasonal restrictions can also apply. Confirm current rules with the road authority or your carrier before loading. The IRU also publishes guidance on the TIR system at iru.org.
Weight is where mistakes happen. A truck and trailer types chart may show a high payload, but dense cargo such as stone or steel reaches the axle limit before the trailer is full. Plan weight, not only volume.
How to choose the right truck and trailer types
Work through this list before you request a quote:
- Cargo: packaging, pallet count, length, height, weight and value.
- Loading method: side, rear or top, and whether a forklift or crane is available.
- Temperature or hazard needs: reefer, tanker or ADR.
- Route limits: height, width, axle weight and permits in each country.
- Documents: CMR consignment note and, where needed, a TIR carnet.
Good securing is part of the choice. Straps, edge protectors and anti-slip mats keep the load stable on mountain roads. Our guide to freight and logistics terms explains words you will meet in a quote.
Confirm current trade, banking and insurance restrictions with your bank or legal adviser. Rules and permit systems change, so verify them with the relevant authorities.
Common mistakes when choosing truck and trailer types
Most booking problems come from a few repeat errors.
- Booking by volume only. Dense cargo hits weight limits first.
- Ignoring the loading side. A dock without side access cannot serve a curtain-sided trailer loaded from the side.
- Skipping lashing details. Loose cargo shifts on long mountain stretches.
- Assuming every reefer is suitable. Ask for the set temperature and certificate.
- Telling the carrier about oversize cargo too late. Permits take time.
- Mixing incompatible goods, such as food and chemicals, in one trailer.
Avoiding these errors saves more money than negotiating the rate. A short checklist, sent with the request, lets the carrier match the right vehicle on the first attempt. Clear truck and trailer types in the booking also help the driver, the warehouse and the customs broker plan their work.
Frequently asked questions
What is the most common trailer for international freight?
The curtain-sided semi-trailer. It carries most palletized cargo and loads from the side or rear.
Can I use a standard trailer for machinery?
Only if the machine fits within legal height, width and weight. Tall or heavy machines usually need a lowbed or flatbed, and sometimes a permit.
Do all refrigerated trailers meet ATP rules?
No. ATP certification applies to equipment used for perishable food in international carriage. Ask for the certificate and the set temperature before booking.
Why do truck and trailer types change the price?
Specialised trailers are scarcer and may need permits, escorts or extra driver time. A curtain-sided unit is usually easiest to source. Price also depends on route, season and waiting time.
Get the right vehicle with Royan Logistic
Tell us the cargo, dimensions, weight, route and loading method in our quote form. We will propose a suitable vehicle and compare options. If your cargo is containerised, read container shipping from Iran for the sea-side alternative.
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