As guessed/suggested above, and, as I dimly recalled seeing years ago Coleman BF-55 : Federal F-55: Which way tug.

Double-GM-Cab Coleman"CF-55-AF," or perhaps a Federal "F-55-AF"
Read/view this - be sure to scroll down.
Attachments
tow tractor and bomber.jpg (73.05 KB, 219 downloads)
rtug tractor estored-630x420.jpg (28.3 KB, 221 downloads)
coleman towing tractor.jpg (17.43 KB, 220 downloads)
tow tractor plant 1.jpg (30.92 KB, 193 downloads)
tow tractor plant 2.jpg (30.24 KB, 191 downloads)