This cement truck is around the state. Funny thing, the company it belonged to was named Griswold construction. I think they got bought out, but anyway.
http://www.flickr.com/photos/greendestiny/332252724/
You can find it on youtube also, but no great videos. It does rotate still though, some there must be a nice slipring setup on it.
Found a decent one;
http://www.youtube.com/watch?v=7S2IkPF5j08