green powerful big rig semi truck with oversize load yellow sign on the roof transporting crawler on the step down 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 green 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 winding