NICE truck Steve!
I am glad that you took that first picture of the car tire and motorcycle tire; side by side like that. I have been eyeing the new Michelin Alpine that I have; alongside the new G/W wheel and tire I just bought off Ebay. The car tire certainly looks "fatter" and from looking at the clearance in the F6B's rear wheel well... it would almost seem that it would be almost touching the sides of it.
How much side clearance is actually available, after one installs any 195/55R 16 car tire in there...?