it's not a sleeper cab, but it's certainly got the look of the evolutionary predecessor of the sleeper cab

http://libwww.freelibrary.org/digital/item/zoom/20147

crew cab dump truck... odd and early

Found on http://vectorville.blogspot.com/

Petrosexual Tumblr has some cool stuff, and super wide variety, tractors to babes, drifters to muscle cars

Prepare to spend a lot of time browsing through the fun at http://petrolsexual.tumblr.com/