This is from
Technical Manual: Standard Military Motor Vehicles, 1 September 1943. It's a
2 GT. Yet another variant? It has the 6-stud wheels. (I've been finding loads of civilian-sheetmetal U.S. military trucks in here! I'm glad I remembered I had this book.)
http://www.mediafire.com/imgbnc.php/...4b5236a96g.jpg
http://www.mediafire.com/imgbnc.php/...171ddcac6g.jpg