The Collaborative International Dictionary of English v.0.48:

Trucker \Truck"er\, n.
   One who trucks; a trafficker.
   [1913 Webster]

         No man having ever yet driven a saving bargain with
         this great trucker for souls.            --South.
   [1913 Webster]

WordNet (r) 3.0 (2006):

trucker
    n 1: someone who drives a truck as an occupation [syn:
         teamster, trucker, truck driver]

Moby Thesaurus II by Grady Ward, 1.0:

57 Moby Thesaurus words for "trucker":
   Aquarius, Ganymede, Hebe, Sunday driver, backseat driver, bearer,
   bheesty, bus driver, busboy, busman, cabby, cabdriver, caddie,
   cargo handler, carrier, carrier pigeon, carter, chauffeur,
   common carrier, conveyer, coolie, cupbearer, drayman, driver,
   express, expressman, freighter, gun bearer, hack, hackdriver,
   hackman, hacky, hauler, hit-and-run driver, homing pigeon,
   jitney driver, joyrider, letter carrier, litter-bearer, motorist,
   porter, redcap, road hog, shield-bearer, skycap, speeder,
   stevedore, stretcher-bearer, taxidriver, teamster,
   the Water Bearer, transporter, truck driver, truckman, wagoner,
   water boy, water carrier