Don't quote me on this but I think Warco was connected to the Huber co in Marion Ohio. I don't know who bought out who but there was some sort of connection.
I think this is an old Warco although not a tandem drive. Huber Museum in Marion
http://www.mariononline.com/hubermuseum/images/warco-road-maintainer.jpg
Noticed this on eBay.
http://cgi.ebay.com/HUBER-WARCO-GRADERS-1960-Magazine-Ad-Marion-Ohio_W0QQitemZ120116329310QQihZ002QQcategoryZ99995QQrdZ1QQssPageNameZWD1VQQ_trksidZp1638.m118.l1247QQcmdZViewItem
Jim the ebay ad looks like the one here, but this is quite a ways out here from home, it may have been a cal trans machine, in pretty decent looking shape and I'm told it runs.