Here's a misunderstanding that turns into a very expensive surprise: truckers who haul partial loads often believe their motor truck cargo limit applies to each load separately. It doesn't. Your cargo limit is the most the policy will pay for everything on the trailer at the time of a loss, added together. If you're consolidating partials, their combined value has to fit under that single number, or you're underinsured the moment the trailer is full.
What the cargo limit actually is
Motor truck cargo is written with a per-occurrence limit, say $100,000. That number is the ceiling on what the insurer pays for a single loss to the freight on your covered trailer. It is not "$100,000 per shipment," not "$100,000 per BOL," and not "$100,000 per customer." It's $100,000 for whatever is on that trailer when the fire, rollover, or theft happens.
For a full truckload of one commodity, that's easy to reason about: one load, one value, is it under the limit or not. The trap opens up the moment you carry more than one load at a time.
Where partials break it
Say you run LTL or consolidate freight, and on a given day your trailer holds three partials:
- Partial A: $40,000
- Partial B: $40,000
- Partial C: $40,000
Each one is comfortably under your $100,000 limit. But the trailer is carrying $120,000 of freight at once. If that trailer burns or rolls, the total loss is $120,000 and your policy pays $100,000. You are personally on the hook for the remaining $20,000+, split across three shippers who each expected to be made whole.
The limit didn't reset per load. There's one trailer, one occurrence, one limit, and the values on board stack.
Set a cargo limit that covers your fullest trailer
The rule to run by
Whatever rides on the trailer at the same time has to add up to less than your cargo limit. Not each piece individually, all of it together, at the fullest point of the run.
So the number you need isn't "the value of my biggest load." It's "the most freight I ever have on the trailer at one moment." If you regularly combine partials, that peak can be well above any single shipment. Set your limit above that peak, with room to spare for high-value days.
A few practical checks:
- Know your peak, not your average. One busy week where you stacked $150k on the deck is the week a claim will find you. Insure the peak.
- Watch high-value commodities. Electronics, liquor, pharma, and metals hit the limit fast, even in "partial" quantities.
- Read the freight, not the pallet count. Three light pallets can outvalue a full deck of cheap goods. It's dollars on the trailer, not space used, that the limit tracks.
- If your loads keep growing, raise the limit. It's usually a small premium difference to go from $100k to $150k or $250k, and it's the difference between a covered loss and a lawsuit.
"But it was three separate contracts"
Doesn't matter to the cargo policy. The insurer sees one covered auto, one loss event, one limit. How many bills of lading were involved is your paperwork problem with the shippers, not a multiplier on your coverage. If anything, multiple shippers means multiple parties coming after you for the shortfall.
How this connects to the rest of your cargo coverage
Getting the limit right is only half of it. The other half is making sure the policy actually covers what you haul and how, no surprise commodity exclusions, the right deductible, and reefer breakdown if you run cold. We break that down in motor truck cargo: what's actually covered and cargo insurance requirements. Limit plus scope, together, is what makes a cargo policy pay.
How McClure helps
Tell us how you actually run, single loads or consolidated partials, what you haul, and the most value you ever have on the trailer at once, and we'll set a cargo limit that covers your fullest trailer instead of your average one. Start here, and if a broker or shipper needs proof of your limit today, request a COI and we'll send it over.