TL;DRAn extra charge on a haul that tracks fuel prices — a percentage of base or an indexed amount.
Most carrier contracts price fuel separately from the base rate so the base can stay fixed while fuel floats. The surcharge is a rate line, often pointing at a rate index, and shows as its own charge on the invoice and in the journal.
Where it happens in Sonic
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See it on your contracts
A walkthrough on the agreements and files you actually bill from — not a slide deck.