The conventionals were always more impressive with massive hoods and with a brick like obliviousness to aerodynamics. However as these show, there was some acknowledgement to rounded corners in later years.
Sadly these Texas size, Texas-built trucks are no longer manufactured, but there are still a few on the road.
Find out more on Hank's and at http://www.marmontrucks.com/
Citgo Marmon, Tampa, Florida, April 1998. A rare day cab, fleet truck.
East Penn Trucking Co of Lehighton, Pennsylvania ran a fleet of Marmons. I like the quarter windows in the sleeper of this white painted job in Bradenton, Florida, April 1994.