At the start of WW2 they had only just moved on from pulling guns with horses. The limber was there to carry the tools and ammo. The tractor was just to pull it and carry the crew and their kit. It needed to be manoeverable so was as short as possible and easy to hide when the gun was in action. As the war went on the thinking changed and tractor and limber morphed into a full sized truck.
David
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