It would be nice to see a slightly updated version of the one they previously released - I think it was an very late SP truck, but I have seen photos of them surviving into the 2000's if not today.
Louis, if you're speaking of the F800, I've seen pictures of UP trucks just like it in white.
Maybe next time they can put an actual N-scale cab/nose on it. That 1/196 scale F800 (although nicely detailed) was just too small. With the exception of the wheels, the rest of the model was to scale. I have a couple of them and on one of them I tried my international DuraStar cab/nose in place of the undersized Ford and they look pretty good.
The late model medium-duty F-series are 4000 series Internationals under those Ford skins.
*mod edit - Fixed broken quote box - Ian