[David_Hayward (RIP)]

I do not know the difference myself between the two chassis, but aren't the springs different? The F30 and C30 were initially known as F30S and C60S respectively, suggsting that in the future there would have been lwb versions, but by 1941 this idea must have been dropped and the designations dropped the "S" suffix.

As just mentioned the 6-pounder Portee was rapidly obsolete, although when in production Regina Industries Ltd, a crown corporation based in GM of Canada's former Regina, Saskatchewan plant were occupied with producing 6-pounder guns from scratch. The story makes interesting reading, especially with hindsight and the need for the 17-pounder.

The 2-pounder MCC C8/MG rebuilds included airportable versions, joined in the 17-pounder tractor role with rebuilds of C8/P Predictors. There is a photo of a 17-pounder tractor rebuild of a Chevrolet version in WHEELS & TRACKS suggesting that this was a neat conversion with lower silhouette than the C60L Portee.