Definitely on its stock International axles, but with some rail flanges bolted or welded onto them. Hubcaps make for a nice touch.
As for the bed, it almost appears to be a pile of dirt in it for weight, but not 100% sure on that (I have been known to be wrong before (http://largescalecentral.com/externals/tinymce/plugins/emoticons/img/smiley-tongue-out.gif))
Russel, Belt drive could possible work, as long as it is a cogged belt, may slip under load otherwise. May experiment with that idea