Heavy-duty vehicles (HDVs) are currently responsible for about one-fourth of fuel consumption and greenhouse gas emissions from the transport sector in the European Union. Within the HDV sector in the EU, tractor-trailers represent the largest share of CO2, accounting for roughly 70% of emissions. This paper analyzes the market for new commercial trailers in the European Union in terms of sales by country, manufacturer, and trailer type, and a reviews the current deployment of fuel-saving technologies in the fleet.