1) Log-company employee 2) Menial 3) Wetlands worker 1) Porter 
[occupational title] A swamper in occupational slang is an assistant worker, helper, maintenance man or a person who performs odd jobs. The term has its origins circa 1857 in the southern United States to refer to a workman who cleared roads for a tree feller in a swamp, according to the Oxford English Dictionary. It has since branched out ...
a helper on a truck. 
Swamper is Australian slang for a person who obtains a lift.
a person who inhabits, works in, or is exceptionally familiar with swamps. · a general assistant or laborer; menial. · a person who trims felled trees into logs at a logging camp or sawmill. · a motorist or truck driver, esp. one using a CB radio.