Chevrolet Chevy Van Forum : “what does a g20 where can I find a site with pictures and info on chevy 1990 con...”

http://www.todaysconversionvan.com/cvma/index.html

http://en.wikipedia.org/wiki/Conversion_van

http://www.conversionvansonline.com/

These site will be a great start for you. While looking around the sites, there are a ton of links that will take you to everywhere you would like to go. Enjoy the search.