I've got a half dozen or so Humvee wheels and tires and tried to see how they fit on my 92 f350 and they don't. There is such a wicked offset that the tire and rim hit the leaf springs with out a spacer of some type.

Edit: nevermind I see you don't wan't to use the hummer rim, I just saw that. I bought some black 16.5 inch rims for my half ton 77 ford and put the 37s on it.