Marmon-Herrington TC-48
http://www.imcdb.org/vehicle_369511-Flyer-D-700-A-1970.html

GMC "Vitrina"
http://www.imcdb.org/vehicle.php?id=123532

The make of this vehicle is Marcopolo
http://www.imcdb.org/vehicle_278898.html

MCI MC-7 (posted by R22 Shoal Point)
http://www.imcdb.org/vehicle_304835-MCI-MC-5.html

1974 GMC T6H-4523N (posted by the masses)
http://www.imcdb.org/vehicle_104185-GMC-TDH-4521-1967.html

This vehicle should go back to being "unknown", since it's misidentified by a member and I don't know the actual name of it.
http://www.imcdb.org/vehicle_215694-Eagle-Model-05.html