Volkswagen
Volkswagens were first exhibited and sold in the United States in 1949, but sold only two units in America that first year. On entry to the U.S. market, the VW was briefly sold as a "Victory Wagon". Volkswagen of America was formed in April 1955 to standardise sales and service in the United States. Production of the Type 1 Volkswagen Beetle increased dramatically over the years, the total reaching one million in 1955.
Westfalia
Westfalia-Werke also converted non-Volkswagen vans, and produced trailers and other products, but they were best known for their Volkswagen camper conversions. Westfalia began converting Volkswagen buses in 1951. Their famous "pop-top" package was added later, and became very popular on the second-generation VW Bus from 1966 to 1979, its successor the Vanagon, the Sven Hedin and Florida conversions on the Volkswagen LT, and then the T4 EuroVan, which was discontinued in 2003. This design also inspired many imitators, with dozens of other companies worldwide offering pop-top van conversions. Therefore, not all pop-top Volkswagens are Westfalia conversions, although in the United States, the Westfalia conversion was by far the most common. Conversely, not all Volkswagen Westfalia conversions had pop-tops or cooking facilities. Volkswagen offered a "Weekender" package in the 1970s with a Westfalia interior, but no pop-top. Later, some Vanagon conversions were offered with a pop-top and interior table, but lacked cooking facilities and instead included a luggable 12 volt refrigerator.