Taking the guesses in order:
The one on the left is not a prewar GMC
There is a Fordson there somewhere
The one on the left is a Fordson, I don't know if it's a WOT
From right to left it isn't a Fordson, because that's on the right, it is a Bedford in the centre, it isn't a Chevrolet on the left. But it might be a Chevrolet on the right - but that's not the answer, because it also might be a Ford.