This is and early 1940's KR11, which would have had a RD450 engine and a  5+3 trans double reduction
 rear axle set up as a tractor. This photo was taken at the Fort Wayne engineering test track.

This is a 1947 KB-14, which would probably end up as a tractor. It came complete with
a Continental R6586 engine, with 200 HP from 586 cubic inches.
The KB-14's had flatter grills and fenders than the smaller K models.