You quote out a shipment, budget the number, and then the invoice shows up with hundreds of dollars you never agreed to. If the freight was long, there’s a good chance the culprit was the Linear Foot Charge. It’s one of the quietest ways a big LTL network turns your quote into a moving target, and it hits open-deck-style freight the hardest.
Let’s walk through what it actually is, why long freight sets it off, and what you can do about it.
What the Linear Foot Charge really is
A dry-van trailer is a box with a fixed floor. When your freight takes up more than a set amount of trailer length, usually measured in linear feet along the floor, the carrier can’t sell that space to anyone else. So instead of billing you by weight, they bill you for the length of trailer you tied up.
The common trigger works like this: once your shipment occupies more than a certain number of linear feet, the carrier stops rating it as normal LTL and starts charging you as if you’d rented a big chunk of the trailer. Some networks pair this with a deemed weight, meaning they treat your light, long load as if it weighed far more, then rate it at that inflated figure.
The mechanics are honest enough on paper. The problem is what it does to your bill.
Why long freight gets punished
LTL pricing is built around freight that stacks into a neat footprint: pallets that sit side by side and don’t hog the length of the trailer. Long freight breaks that model.
Think about what you’re shipping:
- A 16-foot length of structural steel
- Twenty-foot pipe or conduit
- A run of scaffolding or racking
- Extruded aluminum, lumber packs, or long fabricated assemblies
None of that is heavy for its size. It’s just long. But on a dry-van floor, length is the expensive dimension, so a light load can trip the Linear Foot Charge and get rated as though it were massive. That’s how a shipment you priced as modest LTL comes back looking like a partial-truckload bill.
Here’s an illustrative example, not a quote or a promise:
| What you saw | What can happen |
|---|---|
| Quoted as standard LTL by weight | Rated by linear feet occupied |
| Light freight, low weight | Billed at an inflated deemed weight |
| One settled number | A bill several times higher |
The dollar swing varies by carrier and lane, so treat that as a pattern, not a figure. The point stands: with long freight on LTL, the rule is working against you before the truck even moves.
This is a cousin of the Density Minimum Charge, which does the same trick to light, bulky freight. If you want the full tour of the accessorial traps, we broke them down in our accessorial charges explainer.
Why open-deck freight is the worst fit for this rule
The freight most likely to trip a Linear Foot Charge is exactly the freight that belongs on a flatbed in the first place. Steel, pipe, lumber, and long assemblies load from the side and the top, not through the back doors of a box. Forcing them into a dry-van LTL system is the mismatch that creates the surcharge.
You shouldn’t have to pay a length penalty just because your freight was born for an open deck.
How partial flatbed sidesteps it
Here’s the part that matters. FlatbedLTL prices partial flatbed by the deck space your freight actually needs, and the quote is locked in. It is not subject to the Density Minimum Charge or the Linear Foot Charge. Your 16 feet of steel is priced as 16 feet of steel, quoted once, and that’s the number.
Why it works on an open deck:
- The deck loads from the side and top, so length and odd shapes are normal, not a problem.
- You share the deck with other partial loads and pay for your portion, not a whole trailer.
- Partial loads can dispatch direct from origin to destination, so there are fewer handoffs and less time on a dock.
That’s the “everybody wins” math: you pay for the space you use, the carrier fills empty deck, and your long freight moves without a length penalty bolted on after the fact.
A quick honest note on fit. Partial flatbed’s sweet spot is roughly under ten feet of deck space and under about 10,000 pounds. If your load is longer or heavier than that, you probably need a full flatbed, and Comet National Shipping handles full open-deck and oversized freight. Right mode, right price, no surprise.
Got a long load that traditional LTL wants to punish for its length? Send it our way. Get a locked-in partial flatbed quote at /get-a-quote, or call (800) 831-5376 and talk to a person who owns your shipment.