Westfalia-Werke also converted non-VW 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 1968–1979, its successor the Vanagon, and then the T4 EuroVan, which was discontinued in 2003. This design also inspired many imitators, with dozens of other companies worldwide offering poptop van conversions. Therefore, not all pop-top Volkswagens are Westfalia conversions (although in the U.S., the Westfalia conversion was by far the most common). Conversely, not all Volkswagen Westfalia conversions had poptops or cooking facilities. Volkswagen offered a "Weekender" package in t