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The short answer

Define the freight first, then confirm who is importing it into Mexico and which Mexican customs broker will file the pedimento. Send that broker a packet whose invoice, packing list and bill of lading agree, choose how the load crosses (through-trailer, drayage handoff or transload), and plan the Mexican inland leg, including the Carta Porte data, before the truck is dispatched.

This page is part of the U.S.–Mexico Freight Shipping Guide.

How the southbound move works

  1. Define the freightCommodity, pieces, packaging, real dimensions, total weight, stackability, loading method, temperature, hazmat status and whether the piece is indivisible and oversize.
  2. Identify the Mexican importer and customs setupWho imports the goods, whether they are registered in Mexico's Padrón de Importadores, and which Mexican customs broker files the pedimento.
  3. Build a document packet that tells one storyInvoice, packing list, bill of lading, origin information and any product permits, all describing the same goods.
  4. Choose the border operating modelThrough-trailer, border drayage handoff or transload, at a named crossing.
  5. Coordinate customs release before the truck arrivesDocuments accepted, classification questions worked, crossing and cutoffs agreed.
  6. Plan the Mexican inland legMexican carrier and trailer, Carta Porte data, route, permits, security and site access.
  7. Give the receiver realistic timingA delivery range that includes border processing, not driving miles alone.

What the shipper needs

The freight facts. A line such as "machine parts, one truckload" is not enough if the freight is 11 feet wide, needs a crane or cannot be transloaded. Real measurements decide the equipment, and they also feed the customs description and the Carta Porte data for the Mexican leg. The Freight Load Planner is a quick way to check what trailer the freight needs.

The Mexican importer. Mexican commercial imports are declared on a pedimento filed through a licensed Mexican customs broker (agente aduanal) or other authorized representative, and the importer must be registered in the Padrón de Importadores. Some products need an additional sector registration or NOM compliance evidence. None of that is something the truck or the freight broker can decide.

U.S. export data. Most U.S. exports to Mexico need Electronic Export Information filed in AES when a single Schedule B classification is valued over $2,500, or when a licence or other mandatory rule applies. Your freight forwarder or export filer handles this; the carrier needs the resulting reference.

The document packet. Commercial invoice, packing list, bill of lading, USMCA certification data when preferential treatment is claimed, and any permits. Check that names, addresses, descriptions, quantities, weights, values and country of origin match across them. See Mexico freight documents.

What changes the plan

  • Crossing. The Mexican customs broker usually works at specific ports, so the broker's location often decides the crossing.
  • Operating model. A sealed through-trailer, a drayage handoff and a transload each change cost, handling and timing. See through-trailer vs. transload.
  • Equipment. Reefer, open-deck and heavy-haul capacity is thinner in many Mexican markets than for dry vans.
  • Dimensions. An oversize load needs U.S. state permits to the border and a separate Mexican federal permit beyond it. See oversize and heavy-haul freight.
  • Value. High-value freight usually needs a custody and security plan across every handoff.

Common failure points

  • Dispatching the truck before the Mexican broker has reviewed the documents.
  • A vague commodity description that the broker cannot classify.
  • An importer that is not registered for the product sector.
  • No one confirming who moves the trailer across and where the handoff happens.
  • A delivery appointment set from driving time with no allowance for border release.

Before requesting a quote

  • U.S. pickup address or city and state
  • Mexican delivery address or city and state
  • Pickup and delivery dates or windows
  • Commodity, pieces or pallets, packaging
  • Dimensions and total weight
  • Trailer type if known
  • Loading and unloading method
  • Special handling (temperature, hazmat, high value, oversize)
  • Whether customs brokers are assigned on each side
  • Preferred crossing, if the broker has one

Common questions

Can FCC handle the customs clearance?

No. FCC is software for the freight workflow and brokerage is through UCW Logistics; neither is a customs broker. We can keep the customs status in the transportation plan and flag what is missing, but the pedimento is filed by the Mexican customs broker acting for the importer.

Should the truck be booked before the Mexican broker reviews the documents?

You can get pricing early. Dispatching before critical customs questions are resolved is what creates waiting time and detention at the border.

What if the trailer type is unknown?

Send the real dimensions, weight, packaging and loading method. Equipment follows the freight, and the Equipment Selector can narrow it down.

How long does a southbound load take?

It depends on the lane, the crossing, customs release and the handoff. We do not promise a border time; we plan a delivery range and confirm it once the load clears.

Get a southbound quote

Send the shipment details you have. We will price the transportation and flag what still needs confirming before the load is ready.

Request a Freight Quote

Official sources

Last verified: 27 September 2026 against the official sources listed.