In Northeast Ohio we had a local competitor to GH man. Uncle Marty's trucks were red and white Chevys.
This outfit had 200 rigs on the road in 1964. In the early days they would change from flat rack to dump box in the backyard on the limb of a shade tree. The gas motor in this thing is huge. One mac and one white mirror, hope to use the seat someday.
Wonder the back story of these 2 yellow buggies.......looks like the have steering wheels, but tracks. ???
I remember reading something awhile back they were railroad service trucks. Edit As shown below these are plane tugs so I guess trusting my memory is not an option
http://67-72chevytrucks.com/vboard/showthread.php?t=555095 These are Coleman aircraft tugs. No tracks, wheels.
Federal Coleman CF-55-AF Tug (goldenageflightmuseum.org) Federal F-55-AF Very heavy aircraft tug Condition: Operational American Coleman, through four contracts (1949, 1950, 1951, and 1954) produced over 900 simply huge aircraft towing tractors, originally designed for towing the Convair B-36 "Peacemaker," but was soon assigned to other duties also. They were very distinctive-looking, due to their back-to-back double cabs -- Coleman-fabricated aluminum cabs hung with Ford doors in 1949 and 1950, and then GM cabs on the 1951 and 1954 contracts. In late 1951, Federal successfully underbid Coleman and also landed a contract (simply calling their model the "F-55-AF"), with their built-to-specs units looking almost identical to the Coleman units, with the exception having Marmon-Herrington hubs, and several other less important details. Our tug is in good running condition but could use a paint job and new upholstery on the double bench seats. Built 7-24-1953 and labeled as model TT-II. Weight 33,500 lbs.