Conversion vans are originally bare, windowless full-size 1/2 ton or 3/4 ton cargo vans such as the Chevrolet Express/GMC Savana, the Dodge Sprinter, and the Ford E-Series. Recently, the Ford Transit Connect has been the subject of conversions. The microvan offers a vehicle with improved gas mileage and marks the first time since companies ceased conversions of Chrysler minivans that a car-based van has been used in conversions. The Conversion Van Marketing Association (CVMA) is a partnership between General Motors and 7 conversion van manufacturers. Exclusive partnership means members of the CVMA are the only manufacturers authorized by GM to build Chevrolet or GMC conversion vans.
Vans used for conversions in the past that are no longer in production are the Chevrolet Van/GMC Vandura (1970–1996), the Chevrolet Astro/GMC Safari (1985–2005), the Dodge Ram Van (1981–2003), Chrysler minivans, and the Volkswagen Eurovan (1992–2004).