The Collaborative International Dictionary of English v.0.48:

Truckman \Truck"man\, n.; pl. Truckmen.
   1. [From Truck barter.] One who does business in the way of
      barter or exchange.
      [1913 Webster]

   2. [From Truck a carriage.] One who drives a truck, or
      whose business is the conveyance of goods on trucks.
      [1913 Webster] Truculence

Moby Thesaurus II by Grady Ward, 1.0:

48 Moby Thesaurus words for "truckman":
   Jehu, Sunday driver, backseat driver, bullwhacker, bus driver,
   busman, cabby, cabdriver, cabman, cameleer, carter, cartman,
   charioteer, chauffeur, coachman, coachy, cocher, cochero, drayman,
   driver, elephant driver, gharry-wallah, hack, hackdriver, hackman,
   hacky, harness racer, hit-and-run driver, jitney driver, joyrider,
   mahout, motorist, mule skinner, muleteer, reinsman, road hog,
   skinner, speeder, stage coachman, taxidriver, teamster,
   truck driver, trucker, vetturino, voiturier, wagoner, wagonman,
   whip