EU has a LOT more truck volume (both in terms of per capita and percentage of freight shipped by truck). This has some complex and not so obvious implications on how long things get hauled. The smaller trucks also make it more economical to do trips between hubs vs hauling across 3000kms (which is reasonably common in the US). Smaller trailer capacity (due to EU length restrictions) and increased depot/truck distribution means a heavier distribution towards shorter hauling.