This is the first version of the Futurliner, designed in 1939. It followed the Streamliner that was introduced in 1936. This particular GM publication is dated April, 1941.
Note the clear canopy. It must have been a beautiful view for the driver but, due to the heat from the sun, it was eliminated when the Parade went back on the road after the WWII.
Also, you can see the new, fully raised, light bar. it would illuminate the area around each Futurliner.