"However, it would give Crown a "made in USA" truck that is actually made in the USA with US parts."

Sorry to say that wouldn't be the case even with a JD engine. I bought a new JD 7220 a couple of years ago. It was manufactured in England. JD smaller diesel tractors (I think under 30 hp or so) are actually built by Yanmar. Many of their small gasoline powered units use Kawasaki engines.. I'm sure there are still many products they manufacture in their American facilities but many parts are imported.

These days the only thing in this country that's 100% made in America are Americans and the tried and true Americans seem to be in short supply...Makes me miss John Wayne