big rig powerful semi truck tractor with oversize load sign on the roof transporting cargo on step down heavy-duty semi trailer

american big business cargo carrier carries carry chassis climb columbia commercial dangerous delivering delivery diesel down driving eco efficient eighteenwheeler engine equipment fifth fleet forest freight gorge haul haulage hauler heavyduty highway industrial load loads logistic logistics long lorry mountain northwest oversize protection pulling rig rigs road route running safety semi semitruck shipping sign step tractor traffic trailer trailers transport transportation transporter transporting travel trees truck trucking trucks wheel wheels white winding