hauler-n; 3 Senses

Sense Number 1: a person who contracts to transport by road

Commentary: HAULER[+person][+contractor][+transporter][+road][+material/+goods]
NOTE: references a person, not a business

He was an independent hauler with his own rig.
Those haulers are going on strike for better wages from their firm.

WordNet 0.0 Sense Numbers: 1

Sense Number 2: a business that transports material or goods by road

Commentary: HAULER[+business][+transporter][+road][+material/+goods]
NOTE: references an organization, not a single individual

Small local haulers collect the bagged or bundled waste.
It's a national hauler that transports a lot of farm produce.

WordNet 3.0 Sense Numbers: 1

Sense Number 3: a truck used to transport material or goods via road

Commentary: HAULER[+vehicle][+truck][+transporter][+material/+goods]
NOTE: references a vehicle, a truck

There was a line of haulers moving up the road, carrying loads of gravel and sand.
A liquid gas hauler jackknifed on the freeway during the ice storm.

WordNet 0.0 Sense Numbers: 1b