What Brokers Miss When They Vet Carriers for Oversize Loads

Three years ago, a colleague of mine brokered an oversized industrial generator — 14 feet wide, 140 feet long with the rear-steer jeep — from a manufacturing plant in Mississippi to a data center project in Ohio. The carrier had OD authority on SAFER. Valid ACORD 25. State permits filed. She did everything she normally did for a carrier approval.

The load made it about 800 miles before the escort drivers took a detour around a road closure. The alternate route had an overhead utility crossing that wasn't on the permitted route. The load clipped it. Nobody got hurt, but the generator took about $340,000 in damage and the road was closed for four hours while a utility crew worked the scene.

The carrier's cargo policy paid. Eventually. After nine months and a coverage dispute. But the shipper's attorney pulled my colleague into the litigation anyway — because they wanted to know whether she'd verified the route, not just that a permit existed.

She hadn't. She verified the permit existed. Those are not the same thing.

The Checklist That Works Fine for Van Loads and Fails on OD Freight

Pull an MC number. Check SAFER. Confirm the ACORD 25. Call dispatch to verify availability. That process is defensible for a standard dry van move. It's incomplete for anything that requires a state permit to travel legally.

Oversize and overweight freight — anything exceeding 102 inches wide, the de facto 13'6" height standard, standard length limits, or 80,000 lbs GVWR on the interstate — requires a state permit in every state it traverses. Those permits aren't general authorizations. They're route-specific, dimension-specific, and often time-specific. A permit for one route is not permission to use a different route if construction, a bridge closure, or a pilot car driver's judgment call changes the plan.

Your standard carrier approval doesn't verify any of that. Here are the four places where OD vetting breaks from the standard process:

Pilot car credentials. Every state that requires escort vehicles sets its own rules about who can operate them and what the vehicles need to carry — specific lighting arrays, communication equipment, warning signs. Some states license pilot car operators. You almost certainly can't verify whether the escort company the carrier hired meets those requirements in each state on the run. But you can ask. And documenting that you asked — and what the carrier told you — is the whole point.

Time-of-movement restrictions. Some states prohibit wide load movement after sunset or during holiday weekends or peak commute hours. Those restrictions are written into the permit. The carrier is supposed to know and follow them. If you never ask whether they do, you have no documentation that you considered it.

Equipment suitability. OD authority on SAFER means the carrier is authorized to operate oversize vehicles. It says nothing about whether the specific trailer configuration they're planning — lowboy, RGN, extendable flatbed, multi-axle modular setup — is appropriate for the specific load you're moving. A carrier with OD authority can show up with the entirely wrong equipment.

Insurance adequacy. The $750,000 BIPD minimum under 49 CFR § 387.9 was set in 1985. It was barely adequate then. For a one-of-a-kind piece of industrial equipment worth $2 million and 14 months to replace, it's not a starting point — it's a floor you may need to clear by an order of magnitude.

The Permit Question

When a carrier says they have permits, that's the beginning of the conversation.

State transportation departments issue OD permits based on the specific dimensions the carrier submits. The permit names the route. If the carrier goes off-route — because dispatch told them to, because there's a road closure, because an escort driver made a call — they're operating without a valid permit on the alternate road. The original permit doesn't transfer. The carrier's insurance might still cover an incident, but the fact that the load was moving illegally is the kind of detail that gets highlighted in discovery.

What you should ask: Can you send me a copy of the permits for this move? Not confirmation that they were filed. The actual permits, so you can see the route, the declared dimensions, and any travel-time windows.

You probably can't catch errors in the permit language — you're a broker, not a permitting engineer. But requesting the permits does two things. First, it confirms the carrier actually pulled them. Some carriers wing it on shorter moves and bet they won't get weighed. Second, when you document that you requested and reviewed permits, that request becomes part of your file.

In the run I described, the permits were real. The problem was an off-route detour that nobody on the brokerage side had considered. Whether asking to see the permits would have prevented that detour, I don't know. But it would have shown documented awareness that the route was a fixed legal boundary, not a general direction.

Pilot Car Documentation

Here's the honest version: I can't independently verify whether a pilot car operator is licensed in Montana or has the right lighting configuration for a Kansas move. I'm not going to pretend otherwise.

But I can ask the carrier who their escort company is, what states are involved, and whether that company has run OD freight in those states before. The answer tells you something about how seriously the carrier runs their OD program. A carrier who knows their pilot car company by name, can tell you what states they're certified in, and has worked with them on similar lanes is operating a real program. A carrier who says they'll figure out the escorts closer to the move date is telling you something important about how they treat compliance.

Write it down. Time, date, who you spoke with, what they said. If the escort company's credentials become an issue two years from now, your notes are the evidence that you asked.

Equipment — Is the Trailer Right for This Load?

This one gets skipped constantly because it feels like the carrier's problem. It is the carrier's problem — right up until the equipment shows up wrong at origin and the shipper calls you.

Before you tender a specialized OD move to MC-1247893 or any other carrier, ask specifically: what trailer configuration are you planning to use? How many axles? What's the deck height? Does that work with the dimensions we gave you?

If the carrier hasn't thought through the configuration before the call, that's a red flag. Oversize moves don't succeed on improvisation. A carrier running a serious OD program will be able to answer those questions without hesitation because they already priced the load around the right equipment.

This isn't a 20-minute conversation. It's a two-minute conversation that tells you whether the carrier is set up to actually run this freight.

Insurance: Know the Replacement Value Before You Talk to the Carrier

Get the cargo value from the shipper before you vet the carrier. Not an estimate — the replacement cost, ideally in writing.

Then look at the carrier's cargo coverage on the certificate. A $100,000 cargo limit might be acceptable for a machine shop's standard tooling. It's not acceptable for a $1.8 million custom transformer that takes a year to re-engineer. Most OD carriers who specialize in this freight carry higher cargo limits, or they buy load-specific riders for high-value pieces. Ask for the endorsement that covers this specific load type, not just the blanket certificate.

If the carrier's cargo coverage is materially below the replacement value and they don't have a rider, that gap is a conversation you need to have with the shipper before the truck rolls — not after a $700,000 accident.

After Montgomery v. Caribe Transport II, LLC — the Supreme Court's unanimous May 2026 ruling that the FAAAA doesn't preempt state-law negligent-selection claims against brokers — every gap in your vetting rationale is potentially a gap in your defense. The question in any future case is what the broker actually did. For oversize loads, "I checked the MC and the ACORD 25" isn't a complete answer.

How I Document This

My OD load file is a separate template from standard carrier approval. It includes:

1. SAFER OD authority confirmed — screenshot or dated pull, with the date and time stamped

2. Permit request — date and method I asked (email or call), and either the permits themselves or a timestamped note of what the carrier confirmed about the route and dimensions

3. Escort/pilot car — company name, states covered, date and time of the verification call and who I spoke with

4. Equipment configuration — trailer type, axle count, deck height, confirmed verbally by dispatch with date, time, and person's name

5. Cargo value vs. coverage — replacement value provided by shipper (noted, preferably in writing), carrier cargo limit on COI, and whether a load-specific endorsement was obtained

If a carrier won't answer those questions, the load doesn't move on that carrier. That's not a hard rule I made up arbitrarily — it's just the minimum threshold for me to believe they actually know what they're doing.

The documentation takes about ten minutes if you have a form. I'm not claiming it prevents accidents. What it does is answer the question that plaintiffs' counsel will eventually ask: what did this broker do, and when?

For standard freight, standard vetting is a defensible answer. For oversize freight, the standard checklist stops before you've actually vetted the load.

— Mason Lavallet

Founder, DOTScreener.com