not to be a wise guy, but have you seen those napa trucks with the big blue and yellow baseball caps on the roof?
I think it would look better. They look great on Advanced-Design trucks of the 50's, and they have a similar shape.
I suppose if you fabbed a visor similar to the one on the AD trucks, it MIGHT be able to be made to look good. But the ones from the As and Ts look nothing like that. So are you trying to make a 'deuce coupe pickup'? Or maybe a deuce custom?