I reckon your on the mark with dif thickness and grades of alloy.
Had a 69 SIIA very solid,several SIIIs all ok until the leyland badge apeared,stage one ute with thin galvinized / poor caping and last 83 SIII ute truck cab alive with powdery mildew and wings chewed up by gravel roads.
Have gone silly on the 130CC with lanogard that might stop the rot,shame about thr lack of gal fittings on the newer wagons.!!!!


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. Don't know if their still that bad.

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