I've searched for this figure. The JD web site with the 1025R specs actually lists this category, but leaves the number column blank.
I'm interested in finding this figure since I'm considering a receiver mounted rack for suitcase weights, and would like to know the factory rating of the capacity. I can find lots of posts about how much weight can be towed behind the tractor, but I can't seem to find the recommended max tongue weight.
Here is the link to the JD specs for the tractor: