Just a updat, it seems that one of the U-70/90 cab type wrecker survived, despite a rusted state...! If it was a prototype, it still exists (at least in 2010)!
Restored, it would be a fantastic unusual display truck!
Compare this:
source:
http://www.flickr.com/photos/sunsetsailor/5793476752/
larger:
http://www.flickr.com/photos/sunsets...n/photostream/
A front view, look at the top of the crane/boom frame:
source:
http://www.flickr.com/photos/sunsetsailor/2521285600/
Whith this:
Source:
http://www.trucksplanet.com/catalog/model.php?id=1930
From other photos, its seems to be in a wooded area, with a lot of old trucks from the 1940 early-1950. All civiliam type cabs, Sterlings, Diamonds, Autocars, Internationals, etc.
G_Mendes