Tractors, Artillery (Aust) No.5 - a 6x6 Ford-Marmon Herrington tractor with purpose-built bodywork, for the 6 inch BL Howitzer - pretty sure I'm correct without checking any further.
Mack heavy artillery tractor - don't remember the Mack model off hand - for the 5.5inch BL. Both retained post-war. The 5.5 inch outlasted the Mack, being finally towed by the Truck, 5 ton, 6x6 F1 (No, it's not a 'Mk.5' as commonly stated, but an 'F1') built by International Harvester.
Mike C
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