The 11 cab was based on British guidelines but with larger North American 6 cylinder or the mighty Ford V8. Access to the engine was difficult, the foot area for the driver extremely cramped, and the cabs were hot. To do any major work to the engine it was expected you would remove the cab.
Cab 12 offered better ventilation, slightly better access to the engine, but still retained the cramped pedal arrangement.
Dec of 41 came the "all Canadian" 13 cab which used production and design methods better suited to North America manufacture. The cab 13 is perhaps more iconic as a CMP with it's recognizable reverse slope windshield, but any of the CMP series are unique and tell a story.
Any version of the artillery tractors is desirable, despite the cramped entry of the early cabs.
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