The information I have does indicate that it is a 1938 Diesel #10 autopatrol, single axle drive, weighing around 13,660 pounds for the base machine. I believe it should have a 4 cylinder 4 1/4" bore x 5 1/2" stroke engine (D4400-same as the D4 tractor of that era) rated 44 hp @1400 rpm in it.
My opinion is 2500 is a little high if it doesn't have decent tires etc.
Any pictures?
There's one on e-bay right in Martin,SD now starting bid at $750
That's not very far from you...
Thank you for the information! I will work on pictures the next time I go down to see it.