Destuffing Over-Height Containers at Port: When and How
Destuffing over-height containers means using specialized cranes to lift out-of-gauge (OOG) cargo from an Open Top or Flat Rack container in the port yard and transfer it onto a low-bed trailer. This brings the total vehicle height within the legal road limit (4.2 metres for cargo trucks, 4.35 metres for container trucks) and allows the empty container to be returned early.
When importing production lines, tanks or substations, many cargo owners assume that once the carrier has accepted an over-height container to a Vietnamese port, a tractor can simply haul the whole container to the factory. In reality, height limits for stowage on a vessel differ from height limits on domestic roads, so the shipment can get stuck right at the port gate. This article explains when destuffing at the port is needed, the 5-step process and how to avoid extra costs, from H-Cargo's perspective.
Table of contents:
I. Why does over-height cargo in Open Top and Flat Rack containers often have to be destuffed at the port?
II. When should you destuff at the port, and when should you truck the whole container to the factory?
III. What are the steps for destuffing an over-height container at the port?
IV. Mistakes that create extra costs when destuffing over-height cargo
V. Frequently asked questions (FAQ) about destuffing over-height containers
VI. Conclusion
I. Why does over-height cargo in Open Top and Flat Rack containers often have to be destuffed at the port?
Over-height cargo usually has to be destuffed in the port yard because if the unit stays on the container floor and is placed on a standard trailer, the total height from the road surface easily exceeds the 4.2-metre limit (4.35 metres for container trucks), or the receiving factory lacks the crane capacity to unload it.
These limits are set by the Law on Road Traffic Order and Safety 2024 (Law No. 36/2024/QH15) and Circular 12/2025/TT-BXD (amended and supplemented by Circular 19/2026/TT-BXD) of the Ministry of Construction. There are three main technical reasons:
1. Accumulated height exceeds the road limit: Under Article 16 of Circular 12/2025/TT-BXD, the maximum loading height from the road surface is 4.2 metres for open-bed trucks of 5 tonnes or more and 4.35 metres for container trucks. Quick calculation: total height = trailer deck height + container floor thickness (if the container is kept) + timber dunnage + cargo height. Illustrative example: a standard trailer deck is about 1.4–1.5 metres, a 40' Flat Rack floor about 0.6 metres and dunnage about 0.15 metres, so the base alone is about 2.15–2.25 metres; cargo about 2 metres tall or more already reaches the 4.2-metre threshold, easily hitting overpasses, toll gates and power lines. Actual figures must be measured for the specific truck and container.
2. The factory has no crane to lift cargo out from the top: Over-height cargo packed in Open Top or Flat Rack containers cannot be unloaded with a forklift driving into the container as with dry containers; it must be lifted vertically by crane. If the workshop has a low roof or a crane with enough capacity cannot be hired, destuffing in the port yard onto a low-bed truck is usually the more sensible option.
3. Lower container deposit and detention charges (Detention – DET): Open Top and Flat Rack containers are special equipment; free days are usually fewer and container deposits usually higher than for dry containers, depending on the carrier. Destuffing at the port allows the empty to be returned early, significantly reducing DET risk and the risk of damaging the container during unloading at the warehouse.
II. When should you destuff at the port, and when should you truck the whole container to the factory?
Whether to destuff in the port yard or haul the whole container to the warehouse depends on 4 factors: the calculated total vehicle combination height, the cargo structure and base packaging, crane capacity at the factory, and the inland transport distance. When designing a plan for out-of-gauge cargo transport (OOG), the H-Cargo Project Team usually compares the two options below:
Table 1: Decision matrix – destuffing in the port yard vs. hauling the whole container to the warehouse
Criteria | Option 1: Destuff at the port onto a low-bed trailer (Lowbed) | Option 2: Place the whole container (OT/FR) on a low-bed trailer to the warehouse |
Height condition | With the whole container on the truck, total height exceeds the limit; removing the container floor lowers it by about 0.6 metres (reference, depends on Flat Rack type). | Total height (truck deck + container floor + dunnage + cargo) stays within the 4.2-metre limit (4.35 metres for container trucks). |
Cargo structure | A rigid single-piece unit with clear lifting lugs that can withstand one transfer lift at the port. | Several small units combined on one Flat Rack, or tanks firmly fixed to timber cradles that should not be separated midway. |
Equipment required at the factory | More flexible: the low-bed truck enters the workshop and the cargo is lowered by mobile crane, jacks or hydraulic skidding depending on site conditions. | The factory needs a crane with enough lifting capacity and reach to lift cargo over the top of the container, plus space to remove lashings. |
Extra costs at the port | Crane and destuffing charges at the port yard; early empty return significantly reduces detention (DET) risk. | No destuffing charge at the port, but a container deposit is required (usually higher than for dry containers, depending on the carrier), with DET risk and the cost of hauling the empty back. |
The table is indicative; the final decision should be based on cargo dimensions and weight, actual truck deck height and each port's tariff.
Related articles:
- Lashing & securing project cargo: standards and correct practice
- Wooden crating for project equipment (with ISPM 15)III. What are the steps for destuffing an over-height container at the port?
Destuffing an over-height container at a Vietnamese seaport usually takes 5 steps and requires coordination between field staff, port yard planning and the low-bed truck team.
Cargo at the port is under customs supervision under Circular 38/2015/TT-BTC (amended and supplemented by Circular 39/2018/TT-BTC of the Ministry of Finance) and each port's operating procedures. Typical steps:
Step 1 - Complete customs procedures and register the destuffing plan: Once the import declaration is cleared (or approved for moving cargo for storage or inspection as regulated), field staff present the carrier's Delivery Order (D/O) and register the OOG crane destuffing plan with the port, via ePort or the port's commercial office depending on the port.
Step 2 - Move the container to the destuffing area: The port uses a reach stacker or suitable equipment, combined with an over-height frame, to move the Open Top or Flat Rack container from the container yard (CY) to the designated destuffing area.
Step 3 - Open the tarpaulin, remove roof bows and release lashings: Cut the seal, open the tarpaulin, remove the Open Top roof bows (or release the wire lashings on the Flat Rack), store them carefully for container return, and check the lifting points on the cargo.
Step 4 - Lift the cargo onto the low-bed trailer and re-secure it: A mobile crane or specialized yard crane uses a spreader bar to lift the cargo straight out of the container and lower it onto the load-bearing position of the low-bed trailer. The H-Cargo team then secures the cargo on the trailer to the lashing and securing standards for project cargo in line with the CTU Code (MSC.1/Circ.1497).
Step 5 - Return the empty and move the cargo through the port gate (gate-out): Refit all roof bows and the tarpaulin, check the container condition and return the empty as instructed by the carrier (at the port or a depot), obtain the Equipment Interchange Receipt (EIR); and complete procedures through the customs supervision area at the port gate to transport the cargo to the factory.
Field example: when should a 40' Flat Rack unit stay intact on the low-bed truck?
Not every over-height shipment should be separated from its container. In one shipment handled by the H-Cargo Project Team, two large steel tanks were placed on timber cradles and secured on a 40' Flat Rack container, then the whole unit was loaded onto a low-bed truck at the workshop; the cargo and Flat Rack travelled as one block on a single vehicle.
For this type of cargo (round tanks on shaped cradles secured as one block with the Flat Rack floor), separating each tank at the port would break the anti-roll cradle system, require re-bracing and extra heavy lifts. Keeping the unit intact on a low-bed trailer is usually more sensible, provided the total vehicle combination height is calculated in advance and the route is surveyed; if it still exceeds the limit, a road permit is required.
IV. Mistakes that create extra costs when destuffing over-height cargo
The three most common mistakes are using the wrong lifting equipment, losing or damaging Open Top container accessories, and lifting cargo without a spreader bar.
Mistake 1 - Using a forklift to drag cargo out of an Open Top container: Some contractors tie cables to a forklift to pull tall cargo through the rear door, causing it to hit the header bar, bend the container or tip the machine. For over-height cargo, remove the roof bows and lift vertically by crane.
Mistake 2 - Tearing the tarpaulin or losing roof bows: During destuffing, the tarpaulin and roof bows are usually removed and stored separately. If the tarpaulin is torn or roof bows are missing at return, the carrier will charge repair costs (M&R – Maintenance and Repair) and deduct them from the container deposit.
Mistake 3 - Not using a spreader bar when lifting: If all slings are gathered onto a single hook, lateral compression can deform the top of the equipment or break the wooden crate. A spreader bar keeps the slings almost vertical and distributes the load evenly across the lifting points.
V. Frequently asked questions (FAQ) about destuffing over-height containers
Below are answers to 3 questions cargo owners often ask when handling over-height containers at the port.
1. What if the total height still exceeds 4.2 metres after the cargo has been destuffed onto a low-bed trailer?
The vehicle must have a road permit before leaving the port. Under Circular 12/2025/TT-BXD (amended and supplemented by Circular 19/2026/TT-BXD), indivisible cargo whose loaded height from the road surface exceeds 4.2 metres (more than 4.35 metres for container trucks), or that is wider than 2.5 metres, longer than 20 metres, or where the vehicle combination's gross weight exceeds 48 tonnes, is classified as oversized and overweight cargo. Vehicles carrying such cargo must have a road permit issued by the Department of Construction, follow the route and times stated in the permit, and use escort vehicles when the permit requires.
2. Can over-height (OOG) cargo be delivered directly at shipside (direct delivery)?
Yes, if the port and carrier agree and customs procedures are completed before the vessel berths. Direct delivery at shipside saves one yard drop and lift and reduces collision risk, but requires the low-bed truck, lashing plan and staff to be ready at the berth during the vessel's working shift. Cargo owners should discuss this early with the carrier and port to confirm whether the port accepts this option.
3. How long does it take to complete procedures and destuff an Open Top or Flat Rack container at the port?
If the declaration is cleared and the crane shift is booked in advance, destuffing one container is usually completed within the day. Actual time depends on the port's equipment schedule, number of units, lashing complexity and weather, covering: moving the container to the destuffing area, removing the tarpaulin and lashings, lifting cargo onto the low-bed truck, re-securing and completing container return.
VI. Conclusion
Destuffing over-height containers is not always mandatory, but it is an option to plan while the cargo is still at the port of loading. The key is to calculate the total vehicle combination height correctly against the 4.2-metre or 4.35-metre limit, then compare the cost of destuffing at the port with container deposit, detention and the factory's crane capacity. Three things to do before the vessel arrives:
Obtain drawings, dimensions, weight and lifting points of the cargo to calculate total height for each truck type.
Register the crane destuffing plan with the port in advance and book a suitable low-bed truck.
Prepare dunnage and lashing materials, and count container accessories so the return is not charged for repairs.
Send cargo drawings and specifications as early as possible before the vessel arrives so the H-Cargo team can propose a suitable destuffing and transport plan.
Author: Navy Ngo - Project team
Contact us for a free consultation:
H-Cargo International Logistics
113-115 Ung Van Khiem St., Ward Thanh My Tay, Ho Chi Minh City
Tel: +84 888 909 186
Email: project@hcargovn.com
Web: www.hcargovn.com
Sources cited: Law on Road Traffic Order and Safety 2024 (Law No. 36/2024/QH15); Circular 12/2025/TT-BXD and Circular 19/2026/TT-BXD of the Ministry of Construction; Circular 38/2015/TT-BTC and Circular 39/2018/TT-BTC of the Ministry of Finance; IMO/ILO/UNECE CTU Code (MSC.1/Circ.1497); the article on out-of-gauge cargo transport on hcargovn.com. Accessed 29/10/2026. For reference only, not a quotation. Check that regulations and port tariffs are in force at the time of application.
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