The Ford E-Series currently holds 79.6% of the full-size van market in the United States with 168,722 sales in the United States in 2007. The E-series is a tow vehicle, due to the available GCWR (Gross Combined Weight Rating) of up to 20,000 lb (9076 kg), and its relatively low curb weight. Ninety-five percent of van sales are to commercial or fleet-end users, about half are cargo vans. The E-Series cargo area features a double-wall design which leaves the exterior sheet metal less vulnerable to damage from shifting cargo