Denny,
I recently helped a friend haul a military vehicle which I believe is a M715 (Google M715 Jeep and you will see examples). This is a military version of a Jeep, built in 1969. It has an open top and along the upper windshield frame are two vacuum wiper motors. So, that is the latest I am aware of. I now see you asked about GM, but I was surprised to see vacuum wipers so late in production, and military no less (they must have thought them reliable, you would think).
Last edited by Lightholder's Dad; 05/28/2009 4:08 PM.
