Thanks all for the information, pics and links.
I actually found a second link in armorama with a more detailed description on how the TOW launcher is mounted specifically on the HMMWV.
http://www.armorama.com/modules.php?op=modload&name=Sections&file=index&req=viewarticle&artid=624xPLAN303Ex: The portrait of the artist I am not.
http://xplan303ex.wordpress.com