Didn't somebody capture some images from the trailer for Fanboys a while back?
http://www.imdb.com/title/tt0489049/

http://videoeta.com/movie.html?via=form&id=82572

http://www.dvdactive.com/news/releases/fanboys.html

I can't seem to find it anywhere. In any case, the van driven by one of the main characters is a 1980-something Chevrolet G-Series van. Either Chevy Van or possibly even a Nomad.