06-03-2010, 09:11 PM
The two Roco military trucks look like International Harvester trucks from either WW2 or Korean war vintage. The yellow KW looks like it has the wide hood from the 1970's or newer. When a 220 or 250 Cummins or a 6-71 Detroit was big power, the trucks had narrow hoods. When the 318 & 350 Detroit Diesels and the 335 & 350 Cummins started showing up in trucks, they needed bigger radiators, so the grilles got a lot wider.