a person who hauls.
a commercial trucking company.
a vehicle used for hauling or trucking.
Slang. a car capable of very high speeds.

1665–75; haul + -er1

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World English Dictionary
haulier or (US) hauler (ˈhɔːljə, ˈhɔːlə)
1.  a person or firm that transports goods by lorry; one engaged in road haulage
2.  a person that hauls, esp a mine worker who conveys coal from the workings to the foot of the shaft
hauler or (US) hauler

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Example sentences
Unlike other early steam locomotives, it will become a commercial success as a
  coal hauler.
But there's no changing the fact that it's an ungainly large family hauler, and
  not a terribly attractive one.
He spent the morning cleaning his team's souvenir hauler and hooking up a
  propane tank to remove the chill of a damp day.
Both cars were really fast, but both got loaded into the hauler early.
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