To throw something else into the mix, I see Wheels and Tracks #30 quotes the kerb weight of the GS at 5850 lbs and its gross weight as 8950 lbs. Does that make its weight load 3100 llbs? At 2240 lbs to the UK ton, that means the weight load is 1.38 tons or 27.68 cwt!
There was a 30 cwt variant of the C9. Based on these figures, it's not hard to see why.